Symptoms
When logging in to Roundcube/Horde webmail, the login fails with:
Connection to storage server failed.
or the page loads for some time and then shows:
external Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.The Dovecot service fails to start. The following error message appears in
/var/log/maillogor in the service status:dovecot: config: Fatal: Error in configuration file /etc/dovecot/conf.d/14-plesk-sni-example.com.conf line 7: ssl_cert: Can't open file /usr/local/psa/var/certificates/scfNkZxBn: No such file or directory
Cause
The SSL certificate file for securing domain's mail does not exist in the system.
Resolution
Connect to the Plesk server via SSH.
Check if the domain from the error message exist in Plesk with the command:
# plesk bin site --list | grep example.com
Repair SSL certificates:
# plesk repair web -sslcerts
Restart the Dovecot service:
# service dovecot restart
If the service still fails to start, apply the following steps:
Go to Domains > example.com > Mail Settings.
Set the option SSL/TLS certificate for mail to "Not selected" and apply the changes.
Select SSL certificate back and apply the changes.
Remove the orphaned configuration files:
Note: Replace example.com with the domain name from the error message.
# rm -f /etc/dovecot/conf.d/14-plesk-sni-example.com.conf
# rm -f /etc/dovecot/conf.d/14-plesk-sni-mail.example.com.conf
Check Dovecot configuration:
# dovecot -F
Restart the Dovecot service:
# service dovecot restart
