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Knowledge Base

Website on Plesk server suddenly started to show 500 error: AH10292: Invalid proxy UDS filename

 
apachegointernal server errorosphp

Symptoms

  • Websites show the following error:

    AH10292: Invalid proxy UDS filename (proxy:unix:///var/www/vhosts/system/example.com/php-fpm.sock|fcgi://127.0.0.1:9000/var/www/vhosts/example.com/httpdocs/public/index.php)


    external Server Error

  • Apache has been updated to a new version recently:

    Ubuntu 20.04:

    # grep 'status installed' /var/log/dpkg.log | grep apache2:amd64
    2021-09-27 12:46:57 status installed apache2:amd64 2.4.41-4ubuntu3.5

    Ubuntu 18.04:

    # grep 'status installed' /var/log/dpkg.log | grep apache2:amd64
    2021-09-28 06:25:55 status installed apache2:amd64 2.4.29-1ubuntu4.17

Cause

This is an Apache bug which arose with Ubuntu packages update and later fixed in the following versions:

  • Apache for Ubuntu 20 version 2.4.41-4ubuntu3.6.
  • Apache for Ubuntu 18 version 2.4.29-1ubuntu4.18.

Plesk uses Apache packages from OS repositories and does not control their version updates.

Resolution

Update Apache packages to fix the issue:

  1. Log in to Plesk.

  2. Go to Tools & Settings > Server Management > System Updates and click Recheck now.

  3. Once updates are detected, click Update all.

The issue should be fixed, verify that websites are back online.

If Apache updates are not available

  1. Connect to the server using SSH.

  2. Execute below command:

    # sudo apt-mark unhold apache2

  3. Apply steps 2-3 from the resolution.

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