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Title: Plesk domains are not accessible with a 502 error: More than one MPM loaded
Post by: Suhitha on Oct 04, 2025, 04:44 AM

Question: Plesk domains are not accessible with a 502 error: More than one MPM loaded

Applicable to:

Plesk for Linux

Symptoms

On a Linux Plesk server, domains are showing a 502 Bad Gateway error when opened via a browser
Apache is unable to start and its configuration check via the apachectl -t command produces the following error:

Code Select

AH00534: ... Configuration error: More than one MPM loaded.

Cause

Misconfiguration of Apache has made it attempt to load more than one MPM module, however by design Apache is able to load only one MPM module at a time.

Resolution

1.Log into Plesk

2.Go to Tools & Settings > Apache Web Server

3.Press Apply without making any changes

4.Start Apache at Tools & Settings > Services Management > Web Server (Apache).

Cobra Forum

Plesk Panel => Webserver => Topic started by: Suhitha on Oct 04, 2025, 04:44 AM