If you see an error like: “Unable to connect to storage server” or “Connection to storage server failed” when logging into Roundcube Webmail via Enhance, it usually means Roundcube cannot connect to the mail server to access your mailbox.

This guide explains the most common cause and how to fix it.
Common Cause
Incorrect email password:
If the password entered in Roundcube is wrong, Roundcube cannot log in to your mailbox and shows a generic connection error.
This is the most common cause, even though the error might sound like a server issue.