You said that the database info was changed by your host , I would bet probably the prefix,
If so then your forum/includes/config.inc.php is now incorrect so the other file crashes.
As been mentioned a few times you need to check this
Probably the best way is using your hosting cpanel.
Goto phpmyadmin.
Make sure you have around 64 tables and there is data in almost all of them.
If tables like users, posts or topics are empty you found a problem and need to load a database backup
Then while still in cpanel
Goto where you create the databases and users and verify the full names including the prefix of your forum database and assigned database user.
Might as well check to make sure that the password is correct or just change the password even if you make it the same.
Make a note of database name,database user name including the prefix and underscore or whatever and password
Also make sure the database user has global privileges.
Then while still in cpanel
Goto the file manager and find forum/includes/config.inc.php
Edit that file with the built in text editor.
The top few lines I have shown before are the database entries.
Correct them as needed save and check your forum
Unless you need to reload the database this should take about 10 minutes.
As a hint from your error it appears that ihlpfi7 is now something like ihlpfi7ucy12nd your user is ihlpfi7ucy12nd_ubb18394
or vice versa
This step is not uncommon when say moving the forum to a new host.
In your case it looks like your host moved you to a new server.
So it sounds like you may need to edit more that the top few lines in forum/includes/config.inc.php for absolute paths.
Last edited by Ruben; 02/10/2021 2:42 PM. Reason: Added Comment
