Migration webmail failure

SYSTEM INFORMATION
OS type and version Debian 12
Webmin version 2.202

I migrated from Debian 11 to 12 on a virgin server and restored the VS’s one by one. Now webmail.abc.com does not open in the browser. There is no failure message in the browser. I can ping the subdomain and the certificates are in place.

I tried to restore the dovecot modul from the old server, but dovecot does not start at all with the old configuration.

How can I troubleshoot the problem? And what am I missing?

Thanks for any help.

Is port 20000 blocked?

Thank you!

Problem solved …

This topic was automatically closed 8 days after the last reply. New replies are no longer allowed.