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Plesk error: AH00526: Syntax error on line 15 of /etc/apache2/plesk.conf.d/server.conf: Invalid command 'plesklog'

Vincent Lauton
Updated
kb: bug kb: fixed Plesk for Linux kb: technical

Symptoms

  • Plesk version is 18.0.76.0

  • Plesk panel shows error:

    PLESK_ERROR: Error: Can not reconfigure web server configurations: Unable to execute httpdmng: [2026-02-17 20:54:18.047] 996608:6994c76a0b84b ERR [util_exec] proc_close() failed ['/opt/psa/admin/bin/apache-config' '-t'] with exit code [1]
    [2026-02-17 20:54:18.145] 996608:6994c76a0b84b ERR [panel] Apache config (17713580570.92369400) generation failed: Template_Exception: AH00526: Syntax error on line 15 of /etc/apache2/plesk.conf.d/server.conf: 
    Invalid command 'plesklog', perhaps misspelled or defined by a module not included in the server configuration

  • Regenerating web server configurations with plesk repair web -y fails with the following error:

    CONFIG_TEXT: [FAILED]
    - httpdmng failed: Execution failed. 
    Command: httpdmng 
    Arguments: Array 
    ( 
    [0] => --reconfigure-server 
    [1] => -no-restart 
    ) 

    Details: [2026-02-17 22:32:45.678] 1168076:6994de7da575c ERR 
    [util_exec] proc_close() failed 
    ['/opt/psa/admin/bin/apache-config' '-t'] with exit code [1] 
    [2026-02-17 22:32:45.765] 1168076:6994de7da575c ERR [panel] 
    Apache config (17713639650.55293900) generation failed: 
    Template_Exception: AH00526: Syntax error on line 15 of 
    /etc/apache2/plesk.conf.d/server.conf: 
    Invalid command 'plesklog', perhaps misspelled or defined by a 
    module not included in the server configuration 

    file: 
    /opt/psa/admin/plib/Template/Writer/Webserver/Abstract.php 
    line: 75 
    code: 0 
    AH00526: Syntax error on line 15 of 
    /etc/apache2/plesk.conf.d/server.conf: 
    Invalid command 'plesklog', perhaps misspelled or defined by a 
    module not included in the server configuration

  • In Tools & Settings > Apache & nginx Settings, the Piped logs option is enabled:

Cause

Product issue:

  • #PPPM-15302 "Fixed the issue where, after updating to Plesk Obsidian 18.0.76, the “Invalid command ‘plesklog’” error was shown if piped logs were enabled for Apache."
    Fixed in:

Resolution

Please consider updating your server:

Workaround

If update is not possible for some reason you may try the following

workaround

As a workaround, disable Piped logs:

  1. Log into Plesk
  2. Go to Tools & Settings > Apache & nginx Settings
  3. Uncheck the box for Piped logs
  4. Press OK

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Comments

1 comment
Date Votes
  • Avatar
    eCom Seller

    Well here's an idea, why have you not immediately halted 18.0.76 distribution when it's knowingly breaking your customers' servers?  This is ridiculous.  It also causes the ubuntu 20 to 22 process to fail at the very last step, so you get to fix this and run the entire 25 minute process over again.  Unreal.

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