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Error message on the Home page in Plesk: module unique_id_module is already loaded, skipping

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Kuzma Ivanov
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Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk for Linux

Symptoms

  • One of the following error messages is shown on the Home page in Plesk:

    PLESK_ERROR: New configuration files for the Apache web server were not created due to the errors in configuration templates: [so:warn] [pid 55597:tid 140252507555968] AH01574: module unique_id_module is already loaded, skipping
    httpd: Syntax error on line 353 of /etc/httpd/conf/httpd.conf: Syntax error on line 13 of /etc/httpd/conf.d/00_mod_security.conf: No matches for the wildcard '00*exclude.conf' in '/etc/httpd/modsecurity.d', failing (use IncludeOptional if required).

    PLESK_ERROR: New configuration files for the Apache web server were not created due to the errors in configuration templates: [Wed Mar 21 12:25:31 2018] [warn] module security2_module is already loaded, skipping [Wed Mar 21 12:25:31 2018] [warn] module unique_id_module is already loaded, skipping Syntax error on line 35 of /etc/apache2/modsecurity.d/rules/tortix/modsec/50_plesk_basic_asl_rules.conf: ModSecurity: Found another rule with the same id .

  • Apache configuration checker reports one or both of the warnings below ("httpd -t" for CentOS/RHEL-based distributions, "apache2 -t" for Debian/Ubuntu-based distributions):

    # httpd -t
    [warn] module security2_module is already loaded, skipping
    [warn] module unique_id_module is already loaded, skipping

  • In some cases, Apache cannot be started.

Cause

The ModSecurity configuration file 00_mod_security.conf contains duplicated records.

Resolution

 

For CentOS/RHEL-based distributions

 

  1. Connect to the Plesk server via SSH.

  2. Open the file 00_mod_security.conf in a text editor. In this example, we are using the vi editor:

    # vi /etc/httpd/conf.d/00_mod_security.conf

  3. Replace "Include" in the lines:

    CONFIG_TEXT: Include modsecurity.d/00*exclude.conf
    Include modsecurity.d/*asl*.conf
    Include modsecurity.d/99*exclude.conf

    with "IncludeOptional":

    CONFIG_TEXT: IncludeOptional modsecurity.d/00*exclude.conf
    IncludeOptional modsecurity.d/*asl*.conf
    IncludeOptional modsecurity.d/99*exclude.conf

  4. Save the changes and close the file.

  5. Locate duplicated ModSecurity modules and disable them:

    # grep -ir security2_module /etc/httpd/ && grep -ir unique_id_module /etc/httpd/

    In case there is a module which is enabled twice in the output above, for example:

    CONFIG_TEXT: /etc/httpd/conf.modules.d/00-base.conf:LoadModule unique_id_module modules/mod_unique_id.so
    /etc/httpd/conf.modules.d/10-mod_security.conf: LoadModule unique_id_module modules/mod_unique_id.so

    disable it by putting a # (hash) character at the beginning of the line in the file 00_mod_security.conf:

    CONFIG_TEXT: #LoadModule security2_module ...
    #LoadModule unique_id_module ...

  6. Restart Apache:

    # service httpd restart

  7. Repair web-server configuration:

    # plesk repair web -y

  8. Log in to Plesk.

  9. Go to Tools & Settings > Web Application Firewall (ModSecurity) > Settings tab and click OK to refresh ModSecurity settings.

 

For Debian/Ubuntu-based distributions:

 

  1. Connect to the Plesk server via SSH.

  2. Open the file 00_mod_security.conf in a text editor. In this example, we are using the vi editor:

    # vi /etc/apache2/conf.d/00_mod_security.conf

  3. Replace "Include" in the lines:

    CONFIG_TEXT: Include modsecurity.d/00*exclude.conf
    Include modsecurity.d/*asl*.conf
    Include modsecurity.d/99*exclude.conf

    with "IncludeOptional":

    CONFIG_TEXT: IncludeOptional modsecurity.d/00*exclude.conf
    IncludeOptional modsecurity.d/*asl*.conf
    IncludeOptional modsecurity.d/99*exclude.conf

  4. Locate duplicated ModSecurity modules and disable them:

    # grep -ir security2_module /etc/apache2/ && grep -ir unique_id_module /etc/apache2/

    In case there is a module which is enabled twice in the output above, for example:

    CONFIG_TEXT: /etc/apache2/conf.d/00_mod_security.conf:LoadModule security2_module /usr/lib/apache2/modules//mod_security2.so
    /etc/apache2/mods-available/security2.load:LoadModule security2_module /usr/lib/apache2/modules/mod_security2.so

    disable it by putting a # (hash) character at the beginning of the line in the file 00_mod_security.conf:

    CONFIG_TEXT: #LoadModule security2_module ...
    #LoadModule unique_id_module ...

  5. Restart Apache:

    # service apache2 restart

  6. Repair web-server configuration:

    # plesk repair web -y

  7. Log in to Plesk.

  8. Go to Tools & Settings > Web Application Firewall (ModSecurity) > Settings tab and click OK to refresh ModSecurity settings.

 

Comments

11 comments

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  • Avatar
    Gjimi

    after updating Plesk / Atomic Basic ModSecurity, apache is completely down due to duplicate rule id.
    i.e. /etc/apache2/conf.d/00_mod_security.conf
    is being rebuilt.

    #chattr + i /etc/apache2/conf.d/00_mod_security.conf
    is a temporary fix. so that the file is no longer writable.

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  • Avatar
    Artyom Volov

    Hello @Gjimi,

    Do you have any directives in Tools & Settings > Web Application Firewall > Settings > Custom directives?

    What exact duplicate rules are in /etc/apache2/conf.d/00_mod_security.conf?

    Could you check that there are no the same duplicate rules in a file /var/asl/data/templates/template-00_mod_security.conf?

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  • Avatar
    Gjimi

    it's not about rule ... everything is loaded twice.

    so always two identical
    /etc/apache2/mods-enabled/security2.conf
    and again
    /etc/apache2/conf.d/00_mod_security.conf

    with content:
    <IfModule security2_module>
             SecDataDir /var/cache/modsecurity
             IncludeOptional "/etc/apache2/modsecurity.d/*.conf"
    </ IfModule>

    at 00_mod_security.conf was still something, but the file is no longer or is now empty and no longer writable.

     

     

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  • Avatar
    Artyom Volov

    Hello @Gjimi,

    I suggest investigating this issue further in the scope of a support request.

    Please create a support request using instructions from the following article:
    https://support.plesk.com/hc/en-us/articles/213608509

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  • Avatar
    Rodrigo Perez

    **SOLUTION**

    This problem occurs when you have security2 and unique_id modules enabled in mods-enabled directory.

    Simply fix this with (Debian/ubuntu):

    # a2dismod unique_id
    # a2dismod security2
    # service apache2 restart

    Plesk should do a check for these apache module configs when the modsecurity application is enabled.

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  • Avatar
    Daria Gavrilova

    Hello @Rodrigo Perez,

    Thank you for your input!

    In the article it is described how to disable the module in ModSecurity itself.

    However the solution, which is provided by you, can be applied as well.

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  • Avatar
    Thomas Hellwig

    Im using Imunify360 and got that error today. Solved it with that resolution. I think it happend after the latest Plesk obsidian update?

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  • Avatar
    Julian Bonpland

    Hi Thomas Hellwig this issue was probably carried from the previous version. After upgrading to Obsidian Apache was restarted and the issue was hit. 

    Glad to hear the issue was resolved.

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  • Avatar
    Dennis Koehler

    Is there any hope that this problem can be solved permanently and does not recur every two or three weeks? I set "IncludeOptional" and the rules are triple-loaded...

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  • Avatar
    Ivan Postnikov

    Hello Dennis Koehler

    I recommend creating a support request to check this.

    Looks like the additional investigation is required.

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  • Avatar
    Miomir Besarabic

    I found today this error on one server:

    Syntax error on line 35 of /etc/apache2/modsecurity.d/rules/tortix/modsec/50_plesk_basic_asl_rules.conf:||ModSecurity: Found another rule with the same id'

    On Ubuntu nothing looks like you described in article:

    /etc/apache2/conf.d/00_mod_security.conf:

    nothing is there

    @Rodrigo Perez Thanks. Your solution helped me.

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