Issue Error 500 after changing from temporary .plesk.page to a real domain

[celebrir]

Server operating system version

Ubuntu 22.04.5 LTS

Plesk version and microupdate number

18.0.71_build1800250729.09

Yesterday I tried renaming one of the Wordpress websites from the temporary .plesk.page to a real domain using this guide.

Since then every access to the site runs in a "HTTP 500" error, with the logs showing an "Apache error" warning of:

AH01071: Got error 'PHP message: PHP Warning: Unknown: open_basedir restriction in effect. File(/var/www/vhosts/nice-newton.***-***-***-***.plesk.page/httpdocs/wordfence-waf.php) is not within the allowed path(s): (/var/www/vhosts/demo.myexampledomain.com/:/tmp/) in Unknown on line 0; PHP message: PHP Warning: Unknown: Failed to open stream: Operation not permitted in Unknown on line 0; PHP message: PHP Fatal error: Failed opening required '/var/www/vhosts/nice-newton.***-***-***-***.plesk.page/httpdocs/wordfence-waf.php' (include_path='.:/opt/plesk/php/8.3/share/pear') in Unknown on line 0'

(IP redacted to ***-***-***-*** and domain redacted to "myexampledomain.com". The "demo." is the used subdomain)

It's not a certificate issue because I was able to update that successfully.

Reverting the changes to the .plesk.page domain made it work again.
I then tried changing the domain with the right hand side tool, with the same result:


Googeling for solutions I found some articles and forum posts, but none worked so far.
Reboots have been unsuccessful as well.

This site is currently a demo but will replace our production Wordpress installation in the future, so another domain change removing the "demo." subdomain will follow later this year.

All help is appreciated!