What does connection to storage server failed mean? This error message is related to Dovecot, and if you see it, it means that Dovecot isn’t running on the server. However, this issue can be resolved by using one of the solutions bellow.

How can I fix Roundcube connection to storage server failed error?

1. Delete all Dovecot index files

This solution is useful if the index files are for older versions of this software. As a result, they don’t work together with new Dovecot versions. This solutions can come in handy if you’ve updated Dovecot recently and you are encountering issues. After deleting all Dovecot index files, the software will notice they are missing, and create them again. Before doing anything, be sure to create a backup. This is a simple solution, and it should help you with Connection to storage server failed in Roundcube on Ubuntu.

2. Add commands to Dovecot’s .conf file

You must apply this solution if Dovecot has reached his per-IP limit. You will be able to recognize this situation if you receive the following message: imap-login: Maximum number of connections from user+IP exceeded (mail_max_userip_connections=10) Try this solution if you encounter Roundcube connection to storage server failed error in Debian.

3. Increase imap process limit

You will view the following error message that requires to use this solution and increase the imap process limit: master: Warning: service(imap-login): process_limit (100) reached, client connections are being dropped After making these changes, check if the Roundcube connection to storage server failed message is gone.

4. Verify logs

Verify Apache logs You must search for the following lines that show the error: cd /var/log/httpdtail -n 20 error_logtail -n 20 domains/domain.com.logtail -n 20 domains/domain.com.error.log Verify Dovecot logs Seek the following lines in Dovecot: tail -n 20 /var/log/maillog

5. Verify accuracy of localhost data

127.0.0.1   localhost If you’re getting Connection to storage server failed in Docker, be sure to try this solution.

6. Run ./buildtodovecot

If the /etc/virtual/domain.compasswd is not in the right format, this will cause the Roundcube connection to storage server failed error. This file should have 7 columns that are separated by colons. When you notice the /etc/virtual/domain.compasswd file has only 2 columns and 1 colon, it will be necessary to input the ./buildtodovecot command. Roundcube connection to storage server failed is an error related to Dovecot, but hopefully, you should be able to fix it with our solutions. Did you find a solution on your own? If so, feel free to share it with us in the comments section.

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