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FAQ and Known Issues

Common Questions

1. End user IP is blocked and I do not know why

If you use CSF, then try to find the IP in CSF Allow/Deny Lists using their documentation and support. If not, then do the following:

  • Go to cPanel Plugins section, choose Imunify360 and enter the Incidents page.

  • Make sure that the IP checkbox at the top of the table is ticked. Enter proper IP or part of IP in the input field and click Enter.

    • If the IP was found, then follow instructions on Incidents page and perform the actions you need, like: add IP to the White List or disable the security rule that has detected this incident.
  • If the IP was not found on the Incidents page, then go to Firewall page and using the same way as in the previous step try to find proper IP in Black List or Grey List.

    • If the IP was found then follow this instruction for Grey List or Black List and move the IP to the White List or just remove from the Black List or Grey List.

If nothing helps, then contact our support team.


There is a corner case of IP whitelisting/port blocking precedence

2. Could I disable IPtables (firewall) or OSSEC, when using Imunify360?

No. Imunify360 will not be able to stop an attack without IPtables and will not be able to detect an attack without OSSEC.

3. Does Imunify360 log events such as adding or removing an IP to/from the Gray List?

Most Imunify360 logs are saved in /var/log/imunify360/console.log. For example, when IP is blocked and added to the Black List, the following lines are added:

INFO [2017-04-15 18:30:00,889]
defence360agent.plugins.protector.lazy_init: IP is BLOCKED
with 300 sec (expiration: 1492281300) (due to SensorAlert)
INFO [2017-04-15 18:30:00,889]
defence360agent.plugins.protector.lazy_init: Unblocking in
CSF as it is already in our graylist
INFO [2017-04-15 18:30:01,663] defence360agent.internals.the_sink:
{'rule_id': 'LF_SMTPAUTH', 'timestamp': 1492281000.8720655, 'attackers_ip': '', 'plugin_id': 'lfd', 'method': 'ALERT', 'ttl': '1'}
When user unblocks himself by captcha, logs look like this:
INFO [2017-04-17 00:51:26,956] defence360agent.internals.the_sink:
{'timestamp': 1492404686.9496775, 'errors': [], 'user_agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36', 'accept_language': 'ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4', 'event': 'PASSED', 'method': 'CAPTCHA', 'attackers_ip': ''}
INFO [2017-04-17 00:51:26,967]
defence360agent.plugins.protector.lazy_init: IP is UNBLOCKED
(due to ClientUnblock)

Adding and removing IPs from the White List is only possible manually, no IPs will be added automatically.

5. To start using Imunify360 we need to know which information is sent to your servers. Could you please give us some more information?

The following info is sent to our server:

  • all the messages from IDS OSSEC (can be found in OSSEC logs)
  • all the messages from mod_security (can be found in modsec_audit.log)
  • users domains (to be checked in reputation engine);
  • CAPTCHA verification info
  • all running scans for malware (maldet scans) and information on cleaning up or discovering suspicious files
  • optionally, suspicious files can be sent to us for the analysis. Files can be sent via UI by marking a proper checkbox

6. No valid Imunify360 License Found.

Check if the agent is running:

systemctl status imunify360

Check access to the central server (e.g. using telnet) ( port: 443).

Run imunify360-agent rstatus and ensure that status is OK

If not, register the agent.

7. I have an error peewee.DatabaseError: database disk image is malformed. What should I do?

Imunify360 uses SQLite database to store its data. Although this database has proved its reliability, database files become corrupted in rare cases. To restore data try to perform the following steps:

Stop the agent.

If you have sqlite3 application installed on your machine, try to make dump of Imunify360 database:

#sqlite3 /var/imunify360/imunify360.db
.mode insert
.output dump_all.sql

You should see new file dump_all.sql in the directory /var/imunify/

Create a new database from this dump file:

#sqlite3 < dump_all.sql

Replace old database with the new one:

#cd /var/imunify/
#mv imunify360.db imunify360.db.corrupt && mv imunify360.db

Start the Imunify360 agent.

If these steps have not solved the problem or no sqlite3 package is installed, then you should create a completely new database:

Stop the agent.

#rm /var/imunify/imunify360.db
#imunify360-agent migratedb

Start the agent

8. Why does my cPanel with LiteSpeed and OWASP ModSecurity rule set trigger 500 error on all web pages after installing Imunify360?

OWASP rule set may conflict with Imunify360 default rule set on a server running LiteSpeed Web Server. We recommend to turn off OWASP rule set prior to installing Imunify360.

Please find more FAQs in our Knowledge Base.

9. Disabling WAF rules for certain countries.

It is possible to disable some WAF rules for IPs that are resolved to be from some country (or other geographical entity). To implement this, a customer should create his own modsecurity configuration file, and include it into the default modsecurity configuration. In case of cPanel, this can be done by creating /etc/apache2/conf.d/includes/countrywafrules.conf and adding it as an include to the /etc/apache2/conf.d/modsec/modsec2.cpanel.conf. Otherwise configuration files might be rewritten by Imunify360 rules update.

Example of contents of such config file:

SecGeoLookupDb /path/to/GeoLiteCity.dat 
# ModSecurity relies on the free geolocation databases (GeoLite City and GeoLite Country) that can be obtained from MaxMind Currently ModSecurity only supports the legacy GeoIP format. Maxmind's newer GeoIP2 format is not yet currently supported.
So a customer need to download this IP database and locate somewhere.

# Lookup IP address 
SecRule REMOTE_ADDR "@geoLookup" "phase:1,id:155,nolog,pass"

# Optionally block IP address for which geolocation failed
# SecRule &GEO "@eq 0" "phase:1,id:156,deny,msg:'Failed to lookup IP'"

# Skip rules 942100 and 942101 for GB country as example

SecRule GEO:COUNTRY_CODE "@streq GB" "phase:2,auditlog,id:157,pass,severity:2,\

Make sure that you have replaced /path/to/GeoLiteCity.dat with the real path to the GeoLiteCity.dat file installed in your system.

Variable GEO is a collection populated by result of the last @geoLookup operator. The collection can be used to match geographical fields looked from an IP address or hostname.


Available since ModSecurity 2.5.0.


  • COUNTRY_CODE: two character country code. Example: US, GB, etc.
  • COUNTRY_CODE3: up to three character country code.
  • COUNTRY_NAME: full country name.
  • COUNTRY_CONTINENT: two character continent that the country is located. Example: EU.
  • REGION: two character region. For US, this is state. For Canada, providence, etc.
  • CITY: city name if supported by the database.
  • POSTAL_CODE: postal code if supported by the database.
  • LATITUDE: latitude if supported by the database.
  • LONGITUDE: longitude if supported by the database.
  • DMA_CODE: metropolitan area code if supported by the database. (US only)
  • AREA_CODE: phone system area code. (US only)

10. How to clone Imunify360 configuration on another system?

The solution is available in FAQ section

11. How to disable Support icon in the Imunify360 UI?

  1. Go to /etc/sysconfig/imunify360/imunify360.config.
  2. And set PERMISSIONS.support_form: option to false.

OR, better, run the following command:

imunify360-agent config update '{"PERMISSIONS": {"support_form": false}}'

12. How to hide the Ignore List tab for end users in the Imunify360 UI?

  1. Go to /etc/sysconfig/imunify360/imunify360.config.
  2. And set PERMISSIONS.user_ignore_list: option to false.

OR, better, run the following command:

imunify360-agent config update '{"PERMISSIONS": {"user_ignore_list": false}}'

13. How to delete malware scan results from Imunify360’s database?

Sometimes, you may need to delete all users’ scan results from the server. This should not be common practice, and we do not recommend doing it on a regular basis. But, if you do need to erase the results of all Imunify360 scans, you can find the instructions below.

  1. First, you need to stop the agent:
systemctl stop imunify360

(on CentOS 7)

service imunify360 stop

(on CentOS 6, Ubuntu)

  1. Connect to the Imunify360 database by running this command:
sqlite3 /var/imunify360/imunify360.db
  1. Execute the following SQL commands:


This will remove all scan results from Imunify360!

DELETE FROM malware_history;
DELETE FROM malware_hits;
DELETE FROM malware_scans;
DELETE FROM malware_user_infected;
  1. Start the Imunify360 service:
systemctl start imunify360

(on CentOS 7)

service imunify360 start

(on CentOS 6, Ubuntu)

We don’t recommend cleaning the scan results for specific users, as it may cause inconsistencies in the malware_scans table. But, in emergencies, you can do it with these SQL commands:

DELETE FROM malware_history WHERE file_onwer = <user>;
DELETE FROM malware_hits WHERE user = <user>;
DELETE FROM malware_user_infected WHERE user = <user>;

Unfortunately, there’s no easy way to delete records in the malware_scans table for a specific user, so the table should be either truncated with the other tables shown in step 2 above, or the records should just be ignored.

If you need any more information on this or anything else related to Imunify360 administration, please get in touch .

14. Imunify360 WebShield ‘Could not allocate memory’ problem. How to fix?

Symptoms: It can have pretty different symptoms (increased IO, CPU and memory usage), but the main one is that WebShield blacklisting (through CDN) does not work.

How to check: Just browse wsshdict log (/var/log/wsshdict/wsshdict.log). If you face the issue, the log will have entries like:

2019-07-09 16:50:06 [WARN]: Could not allocate memory for in rbtree
2019-07-09 16:52:23 [WARN]: Could not allocate memory for in lpctrie

This means that the shared memory is full and no new address is allowed to be added. Shared memory has a fixed size (it’s set in configuration files) and cannot change it dynamically. Currently, the size of shared memory is 20 MB, and it can take up to 89k IPv4 addresses. However, some of our clients have more blacklisted addresses, and when Imunify360 agent tries to place all these IP addresses into shared memory, the aforementioned error occurs.

How to fix: We want to increase the shared memory size.

  1. Modify the second parameter of the shared_storage directive of the /etc/imunify360-webshield/webshield.conf config file, to make it look like:
shared_storage /opt/imunify360-webshield/shared_data/shdict.dat 21m;
  1. Modify the data_size directive of the /etc/imunify360-webshield/webshield-shdict.conf config file to 22020096 (21 MB in bytes: 1024 * 1024 * 21):

  2. Restart imunify360-webshield:

   systemctl restart imunify360-webshield


   service imunify360-webshield reload

The wsshdict daemon is expected to be restarted automatically.

  1. Make sure the shared memory size is actually changed. Run ipcs -m command. It’s expected to have the output like this:
# ipcs -m
------ Shared Memory Segments --------
key      shmid   owner    perms   bytes nattch status  
0x620035c1 4554752  imunify360 600    22020096   4                       
0x00000000 32769    root       644    80         2

The first column must not have zeros (like in the second row), the third column (owner) is expected to be ‘imunify360-webshield’, and size must correspond to values set in the config files (22020096 in our case).

15. How to check "ModSecurity scan" works?

  1. To verify, if ModSecurity scan works, you can use the following command:
curl -v -s -o /dev/null -F 'data=@<path-to-malware-sample>' http://<domain>/

You can get a malware sample file on the

For instance:

wget -O /tmp/
curl -v -s -o /dev/null -F 'data=@/tmp/'

You can find the results of this attempt in the Incidents tab

  1. Also, you can perform the following request which triggers a test rule
curl -v 

Replace with the domain from the test server. And check the Imunify360 console log

grep 'IM360 WAF: Testing the IM360 ModSecurity ruleset' /var/log/imunify360/console.log

16. How to check "automatically scan all modified files" works?

To check "automatically scan all modified files" (i.e inotify scanner), upload a malware sample to some account's webroot via SSH and check if it will appear in the Malicious tab shortly.

You can get a malware sample file on the

Make sure the option is enabled.

And try to upload sample remotely, using user account:
wget -O /tmp/
scp /tmp/  mycooluser@X.Y.Z.A:/var/www/mycooluser/mycoolwebsite_docroot

Or if you proceed under the root, use su:

cd /var/www/mycooluser/mycoolwebsite_docroot
sudo su mycooluser -s /bin/bash -c "curl -o"

where X.Y.Z.A - your server IP address

You can find the results in the Malware scanner > Files tab.

17. Malware file reasons

You can see the advanced reason why a file was detected as malicious.

Go to Imunify → Malware Scanner → Files tab → Reason. See Malware Scanner → Files tab.

A reason pattern looks like the following:

<type>SMW – server malware, CMW – client malware
<detected>SA- stand-alone (file is completely malicious), INJ – injections (malware is injected to some legitimate file)
<ID>a signature ID
<filetype>a file type; see Table 1. File types and their code
<mlwcategory>a malware category, see Table 2. Malware categories
<mlwclassification>malware classification; it varies based on scenario/actions of a malicious artifact (see Table 3. Malware classification)

Table 1. File types and their codes


File typesFile extensions
Markup language fileshtm, html, shtml ,phtml
Server config fileshtaccess
JavaScript filesjs
Perl filespl
Python filespy
Ruby filesrb
Shell scriptsshells in common: sh
Cron filescron
ELF fileself
Other server pagesJsp (asp,aspx), vb
Files with no extension/fake extensionThese files can be named based on the type of malicious code used inside the file - the above other filetype classification can be used based on code.

Table 2. Malware categories


bkdrArtifacts that help attackers with partial or complete access to victims. Example: web shells
toolScripts that are uploaded to victim's servers and can be used to perform certain specific actions like file upload, database access, downloaders/droppers, mailers, brute-force scripts, proxy scripts, etc.
exploitScripts that are uploaded to victim's servers and meant to exploit certain other vulnerabilities or bugs. Example: WordPress/Joomla exploits
spamFiles that deliver spam or point end-users towards spammy content. Example: doorway pages, other SEO spam, spam advertisement, injections, etc.
phishPhishing related malware artifacts
minerAll sorts of miners go under this category
rediMalware artifacts causing redirects for any sort of malicious reason can be covered under this category
defaceAny sort of artifacts that are meant to show off attacker's intentions or to spread a certain message. Example: Defacements, banners, etc.

Table 3. Malware classification


The mlwclassification field is not fixed and may vary depending on the purposes of the malware.

The following table shows the mlwclassification field examples.

  • Sometimes we include a file extension as a part of the malware classification (like php.tool.htaccess or php.tool.cron or php.tool.js). It means that malware artifact involves manipulation of file types mentioned in the classification. For example, the php.tool.htaccess example can be explained as a PHP based malware involved in modifying/dropping content related to htaccess.
  • Sometimes you may see signature categories beginning with elf.troj. The troj classification is mainly associated with ELF file types where we classify trojans as troj.
ad/adwareMalware that drops spammy advertisements in some way falls under this classification.
wshllWebshells of any sort fall under this classification.
google/yahoo/fb/apple/msoft/nflix/msnThis involves expandable classification in which malware involves any sort of incident/attacks regarding big corporates such as Google, Yahoo, Facebook, Microsoft, Netflix, etc.
link/linksCovers malware involving/spreading/dropping spammy links.
bank/edu/ecom/pharma/entCovers different varieties of phishing or malware based on the corporate sector they are targeting. bank stands for banking, edu for education, ecom for e-commerce, pharma for pharmaceuticals, ent for entertainment.
red/rediUsually covers malware involving redirects of any sort. Some may redirect you to spam pages, some works as a part of SMM panels to send traffic, etc.
drpr/dwnldrCovers malware that opens the door to drop more complex malware from a remote location.
upldr/upldMalware that acts as a simple uploader tool that can be used to upload more backdoors/webshells.
inc/inclCovers malware that abuses include/require functions in PHP to execute code hidden in files with non PHP extensions. For example, image file extensions with PHP code hidden inside.
mobi/mobCovers malware scripts that activate/work based on detection of mobile device. One such example can be a few JavaScripts redirects to spammy domains based on detecting the presence of mobile based user agents.
drwyCovers spammy doorway pages.
defaceDeface covers any sort of artifacts that are meant to show off attackers intentions or to spread a certain message. When we use deface in the classification instead of the category it’s because the artifact can be a tool that aids in defacing websites. Something like php.tool.deface explains this scenario.
wp/joom/mage/prestaCovers malicious artifacts targeting major CMS/applications such as WordPress (wp), Joomla (joom), Magento (mage), PrestaShop (presta).
gengen stands for generic. We use it when the signature is generic in nature covering artifacts of different origins but falls under the same category.
mail/mailerIt covers tools that are used for malicious purposes such as mailers.
db/wpdbUsually covers malware infections that affect databases in some way or trying to extract some information from the databases.
exec/eva/eval/cmdCovers malware injections that assists attackers execute code via attacker controlled parameters in HTTP requests.
seoCovers malware campaigns that involve in some sort of SEO specific malicious actions.
gif/img/ico/jpg...An identified artifact/malicious file has PHP code hidden inside file extensions that mimic that of images.
paste/pastebin/pbin/pastebCovers malware utilising pastebin to further drop more malicious content.
create/crtfunc/cf/createfunctionCovers backdoors that relies on using PHP function createfunction to execute code on a victim's server.
stealer/steal/credTo classify malware that steals credentials of any sort.
fakepluginSome malware authors utilise technique of mimicking legit WordPress plugins to conceal the presence of malware. Such fake plugins are covered under this classification.
glob/globalsCovers malware that utilises PHP superglobals based obfuscation to avoid detection.
btrx/bitrixCovers malware that works based on hiding itself inside Bitrix installations.
dos/ddos/flood/booterCovers any typical malware that involves denial of service attacks.
exfilCovers malware that involves in data exfiltration.
filemanager/fileman/fmFor malwares with capabilities of a file manager.
crypto/chive/cimpFor malware that involves stealing cryptocurrencies or mining of cryptocurrencies.
gotoCovers malware that utilises PHP goto feature for obfuscation and to avoid detection.
wpvcd/wpcdFor malware that are involved in the WPVCD malware campaign.
oneliner/onelineSometimes malware authors try to make a backdoor injection as short as possible to accommodate in a single line and deploy various tactics to achieve it. Such malware is covered under this classification.
tmpSometimes we create temporary signatures that will either be deleted/changed to something else after sometime. These are marked with tmp.
wpnull24Malware injections that are part of nulled plugins/themes from the wpnull24 website.
iframeMalware injections that deliver iframe.
sym/symlink/symlnkCovers malware workings related to symbolic links.
cpanel/whm/cp/resetpassMalware/tools that involve stealing/cracking credentials related to cPanel/WHM.
tele/tgramCovers malware involving exfiltration of information using the Telegram API.
conf/confgrab/grabberMalware that involves activities such as grabbing configurations, configuration files, etc.
brute/bruter/wpbrute/bruteforceCovers malware artifacts involving brute force attacks of any sort.
bninja/bloodninjaCovers malware authored by a malware author dubbed bloodninja.
obf/encObfuscated/encrypted malware artifact is somehow obfuscated/encrypted to conceal the malware code.
indo/indoxploit/indoxCovers various versions of IndoXploit webshell.
cracker/crackCovers malware artifacts involving cracking credentials of any sort.
klg/rmsCovers backdoors or webshells related to malware campaigns dubbed klg and rms.
arrayMalware that utilises arrays and array based functions to hide/ make legit looking backdoor code.
skim/skimmerCovers malware artifacts that involve web skimming.
bot/botnetMalicious code that resembles activities of a bot/botnet.
irc/ircbotCovers malicious IRC artifacts.


SMW-SA-05155-sh.bkdr.wshlltype: server malware (SMW)
detected: stand-alone (file is completely malicious) (SA)
signature ID: 05155
file type: shell scripts (sh)
mlwcategory: artifacts that help attackers with partial or complete access to victims (bkdr)
mlwclassification: web shells (wshll)

18. Can Imunify360 firewall block traffic by domain name?

Unfortunately, Imunify360 does not have such ability.

19. What ports are used by WebShield?

The following ports are reserved:

  • 52223
  • 52224
  • 52227-52235

You can find additional information in the following config files:


20. How to check that CAPTCHA works?

First, remove an IP from the White list:

# imunify360-agent whitelist ip delete YOUR_IP 

After that, run the following loop which triggers ModSecurity test rule 5 times in a row that leads to graylisting of the IP due to the sequence of 406 HTTP errors:

# for i in {1..5} ; do curl -s http://SERVER_IP/?i360test=88ff0adf94a190b9d1311c8b50fe2891c85af732 > /dev/null; echo $i; done

Where SERVER_IP is the server's IP address where Imunify360 is installed and where you want to check CAPTCHA.

Also, it is possible to use a domain name of a website which DNS A record is pointed to the server. In other words, which is located on the server, like shown here

21. How to edit watched and excluded patterns for Malware Scanner?

There are two files:

  • /etc/sysconfig/imunify360/malware-filters-admin-conf/watched.txt defines which paths are watched by Imunify360
  • /etc/sysconfig/imunify360/malware-filters-admin-conf/ignored.txt defines which paths are excluded by Imunify360


This exclude list is intended for things like logs, tmp files, etc. Things that are not worth scanning in real-time and should not be allowed to execute. Proactive Defense will prevent include/require of PHP files that are excluded by realtime-scan. There is a separate ignore list for false-positive hits: see Ignore List

The watched.txt file contains additional shell-like glob patterns specifying what file system directories should be monitored by inotify/fanotify realtime scanner.

Patterns can be absolute:


or relative to basedirs supplied by hosting control panels, if they start with a "+" sign:"


This relative pattern will expand to the /home/*/www for cPanel, for example.

All patterns listed here have higher priority than stock watched and excluded lists supplied with Imunify360.


After making changes to this file, run the imunify360-agent malware rebuild patterns command.

The ignored.txt file contains additional regular expression patterns specifying what filesystem paths should not be monitored by inotify/fanotify realtime scanner.

Patterns can be absolute:


or relative to basedirs supplied by hosting control panels, if they start with a "+" sign:"


This relative pattern may expand to the ^/home/[^/]+/www/\.cache for cPanel, for example. The + sign at the beginning is substituted with all base directories for user homes. Imunify360 picks up those directories from hosting panel configuration.

All patterns listed here have higher priority than stock watched and excluded lists supplied with Imunify360.

Custom exclude patterns have higher priority than custom watched patterns.


After making changes to this file, perform the imunify360-agent malware rebuild patterns command.


Starting from v. 6.8, the support for mount namespaces was added. It allows us to collect file events coming from processes running in a separate mount namespace which improves security.

22. How to test rules based on ModSecurity tags?

You can use the following URIs to check what was activated.

curl -k ''

It will produce 403 only for sites with Joomla!.

curl -k ''

It will produce 403 only for sites with WordPress.

23. "Imunify agent is not running" troubleshooting

Having the Imunify service installed, you may come across the situation when the message "Imunify agent is not running" is displayed when you try to access the Dashboard:

First of all, try to check the status of the service via the command line using the following command:

# service imunify360 status

In case you see the agent is inactive:

[root@host ~]# service imunify360 status

Redirecting to /bin/systemctl status imunify360.service
● imunify360.service - Imunify360 agent
Loaded: loaded (/usr/lib/systemd/system/imunify360.service; disabled; vendor preset: disabled)
Active: inactive (dead)

try to start it via the following command:

# service imunify360 start

It may also occur that despite the Imunify’s Dashboard showing the "agent is not running", the service itself is loaded and active.

You can check it with the following command:

# service imunify360 status -l

Example output:

[root@host ~]# service imunify360 status -l

Redirecting to /bin/systemctl status -l imunify360.service
● imunify360.service - Imunify360 agent
Loaded: loaded (/usr/lib/systemd/system/imunify360.service; enabled; vendor preset: disabled)
Active: active (running) since Mon 2020-05-13 02:58:43 WIB; 3min 54s ago
Main PID: 1234567 (python3)
Status: "Demonized"
CGroup: /system.slice/imunify360.service
├─1234567 /opt/alt/python35/bin/python3 -m --daemon --pidfile /var/run/
├─1234568 /usr/bin/tail --follow=name -n0 --retry /usr/local/cpanel/logs/cphulkd.log
├─1234569 /usr/bin/tail --follow=name -n0 --retry /etc/apache2/logs/modsec_audit.log
├─1234570 /usr/bin/tail --follow=name -n0 --retry /var/ossec/logs/alerts/alerts.json
└─1234571 /opt/alt/python27/bin/python2.7 -s /usr/sbin/cagefsctl --wait-lock --force-update-etc
May 13 02:58:39 systemd[1]: Starting Imunify360 agent…
May 13 02:58:43 systemd[1]: Started Imunify360 agent.
May 13 02:58:43 imunify-service[4072717]: Starting migrations
May 13 02:58:43 imunify-service[4072717]: There is nothing to migrate

Most often, such circumstances attest that the Imunify service has been recently installed on the server. Sometimes, a desynchronization between the agent and the web interface may occur in such cases, and it can take a bit of time for the database to be integrated completely.

In case the issue is still the same after 60 minutes, you can try creating the backup of the Imunify files and do the service restart to force the sync process:

# service imunify360 stop
# mv /var/imunify360/files /var/imunify360/files_backup
# service imunify360 start

After these actions, wait until the files downloading and the migration process are complete – the agent will synchronize with the web interface and start working normally. You can monitor this process via

# tail -f /var/log/imunify360/console.log

Another similar workaround may be handy in case you locate some database-related error inside the /var/log/imunify360/error.log – by renaming the database file and restarting the service. There may be errors like

"Imunify360 database is corrupt. Application cannot run with corrupt database."

or some lines with


The imunify360.db file is an sqlite3 database the Imunify360 relies on; it contains incidents, malware hits/lists, settings, etc. Using this workaround will force the database recreation:

# service imunify360 stop
# mv /var/imunify360/imunify360.db /var/imunify360/imunify360.db_backup
# service imunify360 start

If you face any difficulties during the progress or simply cannot make the agent start, please run

# imunify360-agent doctor

and provide the output to our Support Team at

You can find the ImunifyAV(+) instructions here.

24. "ssh_exchange_identification: Connection closed by remote host" troubleshooting

If you see the "ssh_exchange_identification: Connection closed by remote host" few times in a row, then this might be an evidence that SSH is under bruteforce attack and some of concurrent unauthenticated connections are dropped due to the /etc/ssh/ssh_config MaxStartups ... parameter default value. Thus, we would advise you to increase the MaxStartups ... from the default (e.g. 10:30:60) to 100:30:200 or something that is proportional to your SSH server bruteforce intensity (100:30:200 is for 25 attempts per second bruteforce intensity rate).

25. Where can I find the files backup location?

You can find the files backup location in the following directory: /var/imunify360/cleanup_storage/.

26. Ipset max elements error "Hash is full, cannot add more elements"

We would like to describe a possible situation you may come across while adding some IP(s) into the Black/White List. In case you are experiencing difficulties with the procedure and get the following error message within the Imunify360 Dashboard or the CLI:

Command ['/usr/sbin/ipset', 'add', 'i360.ipv4.blacklist', '', 'timeout', '0', '-exist'] returned non-zero code 1,
Stdout: None,
Stderr: ipset v7.1: Hash is full, cannot add more elements

This means the ipset elements limit is exceeded.

The ipset size is hardcoded in the Imunify360 source code and currently, it is equal to a 100K IPs limit. You can confirm it with the following commands:

# ipset -t list i360.ipv4.blacklist
Name: i360.ipv4.blacklist
Type: hash:net
Revision: 3
Header: family inet hashsize 1024 maxelem 100000 timeout 0
Size in memory: 17040
References: 1


# ipset list "i360.ipv4.blacklist" | grep -oP '(?<=maxelem )[^ ]*'

In case you wish to expand the lists to add more elements to a Black/White list, you can use the external one by creating a separate file with the list of the IPs you would like to whitelist/blacklist and placing it inside:




Please mind that apart from single IP addresses, subnets can be also added to blacklists to block more addresses.

Such lists support up to 500K elements. More details about configuring external lists can be found here.


We also would like to clarify the decision of keeping the ipset size as it is – it's not reasonable to further increase the ipset size because it can lead to the degradation of network performance. There is no reason to keep IPs in the blacklist forever because IP addresses used by hackers are often changed. Please be informed that Imunify360 analytics do their best to provide optimal TTL for the graylist to ensure the best protection with a low false positives rate.

You may also want to add a whole region (or certain regions) to the blacklist, which can contain quite an impressive number of IPs. We believe the entire country cannot be malicious and crawlers can be operating from different locations. Still, if you wish to block the whole country/countries and to allow access to your server for specific IPs/subnets, we would recommend that you use the option to "block all except specified" for blocking the majority of common ports and whitelist the necessary IPs/subnets you wish to allow access to your server.

27. How to enable scan for end-users?

An administrator can enable the “scan” action for end-users in the config file via the CLI.

End-user scans are disabled by default. To enable it, run the followint command:

imunify360-agent config update '{"PERMISSIONS": {"allow_malware_scan": true}}'

All user scans are scheduled using a single queue. Thus, multiple scans requested by users will not affect server performance.

28. How can I disable RBL-based WAF protection?

In some cases, one might need to disable the RBL protection for some IPs, and it is not enough to just add the IP address to the Imunify360 whitelist. Because even the IP address is whitelisted but it is listed in our RBL, the request from this IP will be dropped on the WAF level (403 error). So, if you need to whitelist it on RBL, please follow these steps:

  1. Make sure that IP address is already whitelisted in firewall, you can check it via UI or CLI, see more details here:
  1. Run the following command:
imunify360-agent create-rbl-whitelist

After these steps, the Imunify360 firewall whitelist will be synced with the WAF whitelist.

In case if you need to remove it from there, just remove it from the firewall whitelist and run the following command again:

imunify360-agent create-rbl-whitelist


This will not remove the IP from our RBL lists, it just allows passing requests from the abuser's IP to your WEB server ignoring RBL, locally, only on the server where it was whitelisted.

Corner cases

IP whitelisting/port blocking precedence

Imunify360 has a corner case related to the following behavior of the Imunify360 firewall: when some IP is whitelisted and at the same time a certain port is blocked, the access to the port for the whitelisted IP is blocked (the port setting takes precedence).

As a workaround, you may add the IP address to "Whitelisted IP" list for the blocked port:

If you wish to use CLI - you may remove the blocked port for all IPs and add a new record with the list of whitelisted IPs. Here's an example for TCP port 2083:

imunify360-agent blocked-port delete 2083:tcp
imunify360-agent blocked-port add  2083:tcp --ips

How to get an Imunify activation key from the extended Plesk license

Often our clients purchase Imunify licenses through Plesk/Odin and in such cases, they get a universal key which includes the Imunify license and other additional keys for Plesk plugins. Such a key has the following syntax – A00B00-0CDE00-F0G000-HIGK00-LM0N00, – and initially, it is installed through Plesk automatically and the license gets activated successfully.

However, if it is required to re-register the agent for some reason or simply get the Imunify activation key separately, it would be impossible to apply the above-mentioned one – we would need to deal with the Imunify service separately.

To get the Imunify360 activation key from the extended Plesk license key, you will need to proceed with the following.

  1. Navigate to Tools & Settings >> Plesk >> License Management >> Additional License Keys

  1. Click Download key next to the Imunify license listed on the page and open the file downloaded in some text editor

  2. Find the following abstract:

<!--Key body-->
<aps-3:key-body core:encoding="base64" core:type="binary">YOUR_BASE64_ENCODED_LICENSE_KEY==</aps-3:key-body>
<!--Information about additional key-->
  1. This is your base64-encoded key, and it should be decoded using a CLI utility or an online base64 decoder into UTF-8, e.g. The new license key should have the following format: IMxxxxxxxxxxxxxxx.

  2. Use the new key decoded to activate the service:

# imunify360-agent register DECODED_KEY_HERE

This is it!