Website on Plesk server and sudden 500 error

After Apache got updated on our Ubuntu distro, we suddenly started have Error 500 of Plesk shown on all our sites.

AH10292: Invalid proxy UDS filename (proxy:unix:///var/www/vhosts/system/|fcgi://

Then handling of UDS URIs to proxy connections from Apache to PHP-FPM seems to have been modified and that resulted with Error on Plesk.


  1. Connect to the server using SSH with root privilidges.

2. Replace updated version of the file PhysicalHosting.php to /usr/local/psa/admin/plib/Template/Variable/Domain/:

wget && tar -xvf PPPM-13232.tgz -C /usr/local/psa/admin/plib/Template/Variable/Domain/

3. Rebuild webserver configuration files:

plesk sbin httpdmng --reconfigure-all

4. Unhold apache2 package:

apt-mark unhold apache2

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