Forwarded to devs Changing Apache settings from MPM to Prefork and setting a new restart interval after fresh install throws an error message

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Username: Peter Debik

TITLE

Changing Apache settings from MPM to Prefork and setting a new restart interval after fresh install throws an error message

PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE

Obsidian 18.0.34, latest MU
CentOS 7.9

PROBLEM DESCRIPTION

Fresh install.
Tools & Settings > Apache Web Server Settings
Change the restart interval to a value like 600 or 900 or similar.
Change MPM from Event to Prefork.
Click "OK"

Result:

Internal error{"formMessages":{"apacheModules":{"apache_modules":{"notInArray":"This option is not supported."}}},"status":"success","statusMessages":[{"class":"","content":"Apache modules configuration was saved.","source":null,"status":"info","title":"Information"}]}

STEPS TO REPRODUCE

Fresh install.
Tools & Settings > Apache Web Server Settings
Change the restart interval to a value like 600 or 900 or similar.
Change MPM from Event to Prefork.
Click "OK"

ACTUAL RESULT

Red box on top of the screen with this content:
Internal error{"formMessages":{"apacheModules":{"apache_modules":{"notInArray":"This option is not supported."}}},"status":"success","statusMessages":[{"class":"","content":"Apache modules configuration was saved.","source":null,"status":"info","title":"Information"}]}

EXPECTED RESULT

No errors.

ANY ADDITIONAL INFORMATION

I have reloaded the same menu item afterwards, and the settings have been applied.
It seems that the changes were applied to the Apache configuration, too.

YOUR EXPECTATIONS FROM PLESK SERVICE TEAM

Confirm bug

 

[IgorG]

Hi Peter,
Developers can't reproduce the issue. Access to your server is required.
So, please contact Plesk Support Team.