DB Error: SQLSTATE[HY000] [2002] No such file or directory in /var/www/roundcube

[JacobC1921]

Hi all!

Made an account just to get some help with this. I've had no issues with Roundcube at all until now. I am also self-hosting via Yunohost on Debian GNU/Linux 12.

I am receiving this screen when going to the Roundcube address:

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Oops... something went wrong!
An internal error has occurred. Your request cannot be processed at this time.

For administrators: Please check the application and/or server error logs for more information.

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And after checking the error log in

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/var/www/roundcube/logs/errors.log, everytime i refresh the page, it puts into the error log:

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[28-Oct-2025 23:50:04 +0000]: <206ndaep> DB Error: SQLSTATE[HY000] [2002] No such file or directory in /var/www/roundcube/program/lib/Roundcube/rcube_db.php on line 201 (GET /)
This file definitely exists, as I can

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cat /var/www/roundcube/program/lib/Roundcube/rcube_db.php it with no issues, so I'm guessing it may be some sort of permission issue.

Any clue where to go from here?
Thank you!

[SKaero]

That error indicates that Roundcube can't connect to the database. What database are you using and is it running on the server?