Upon changing my server's hostname and then restarting the server (via Plesk and not the host's VPS control panel), all the services start up okay including Apache and Plesk itself, I then get the following errors present in the screenshots attached when visiting the relevant domains. It's a different error for each domain and I have no idea why. Restarting Apache does not fix this nor does restarting the server once more so instead, I have to restore a full-disk backup from a...
Weird error condition upon changing hostname
Weird error condition upon changing hostname