Introduction

If you encounter the DATABASE ERROR: CONNECTION FAILED! while logging into Roundcube, it usually indicates an issue with the Roundcube database connection. This can be resolved by updating the Roundcube installation from the server.

Prerequisites

• Root SSH access to the server
• cPanel / WHM environment
• Basic knowledge of command-line usage

Implementation

Step 1:
Log in to your server via SSH as root

Step 2:
Run the following command:

/usr/local/cpanel/bin/update-roundcube –force

Step 3:
After the process completes, try logging into Roundcube again

Conclusion

By forcing an update of Roundcube, the database connection issue is resolved, allowing you to log in successfully.