Symptoms
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Unable to log in to Webmail with the following error:
Connection to storage server failed.
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Dovecot is installed on the server;
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The following entries can be found in
/var/log/maillog:dovecot: imap-login: Warning: Auth process not responding, delayed sending initial response (greeting): user=<>, rip=::1, lip=::1, TLS, session=<KtEFriOGgq4AAAAAAAAAAAAAAAAAAAAB>
dovecot: imap-login: Error: Timeout waiting for handshake from auth server. my pid=31113, input bytes=0
dovecot: imap-login: Disconnected: Auth process broken (disconnected before auth was ready, waited 30 secs): user=<>, rip=::1, lip=::1, TLS, session=<KtEFriOGgq4AAAAAAAAAAAAAAAAAAAAB> -
The following entries can be found in
/var/log/plesk-roundcube/errors:IMAP Error: Login failed for [email protected] from 203.0.113.2(X-Real-IP:203.0.113.2). Wrong startup greeting (ssl://localhost:993): * BYE Disconnected: Auth process broken in /usr/share/psa-roundcube/program/lib/Roundcube/rcube_imap.php on line 196 (POST /?_task=login&_action=login)
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Valid certificate is used installed on IMAP service:
# openssl s_client -showcerts -connect localhost:993
CONNECTED(00000003)
depth=2 O = Digital Signature Trust Co., CN = DST Root CA X3
verify return:1
Cause
Corrupted Dovecot packages.
Resolution
Warning: switching from Dovecot to Courier and vice versa may result in all the messages being re-downloaded by Mail Client Software (Outlook, Thunderbird, etc.)
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Connect to the server via SSH
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Create a backup of Dovecot folder:
# cp -R /etc/dovecot /root/dovecot/
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Go to Tools & Settings > Updates & Upgrades.
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Install Courier service to remove Dovecot.
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Remove existing Dovecot configs:
# rm -r /etc/dovecot
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Install Dovecot again.
Additional information
Are there any issues when changing the IMAP/POP3 server in Plesk from Dovecot to Courier?