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I have recently taken over responsibility for a website hosted by IONOS, and I recently changed the IONOS login password as it had not been changed for 8 years. I had previously updated the website by creating a MYSQL database, and using the WYSIWIG login tools, I created access controls for a section of the website . When I changed the IONOS PW I didn't change any of the login settings (apart from the database password). The code is the WYSIWIG generated code, and the login had been working perfectly since I set it up a few months ago. Having changed the password, I have been unable to login through the website, or to create any new accounts. I spent 90 minutes conversing with the IONOS helpdesk without resolving the problem, and they suggested that I contact your good selves. I noted in another post that Pablo suggested looking up the php log. I set one up on the server, and have got the following response:

'[07-Jan-2026 18:36:56 UTC] PHP Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'dbu3651169'@'infong-uk18.clienthosting.eu' (using password: YES) in /homepages/34/d472519093/htdocs/cawos/project-area-login.php:29
Stack trace:
#0 /homepages/34/d472519093/htdocs/cawos/project-area-login.php(29): mysqli_connect()
#1 {main}
thrown in /homepages/34/d472519093/htdocs/cawos/project-area-login.php on line 29'

In the login php code, this is the system generated line that provides the IONOS database login credentials. I'm think that this a server side issue, and is not WYSIWYG related, but before I go back to IONOS, I would be grateful for any advice that anybody may have on this issue. And' yes' the password is correct! I also looked at the .har file for the response and it shows:

"response": {
"status": 200,
"statusText": "",
"httpVersion": "http/2.0",
"headers": [
{
"name": "cache-control",
"value": "no-store, no-cache, must-revalidate"
},

But analysing the .har is way beyond my knowledge base! Incidentally, I have cleared my browser cache many times in case the old password was still stored somewhere.

The error generated by the server, indicates that the specified username or password of the MySQL database is incorrect.
You can set the correct values in the properties of the login object.

My idiocy was to forget that the database password was no longer the same as the IONOS login password, not that I didn't know how to change the php. But at least I now have a php log file. My only excuse is that I'm over 70!