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Issue Upgrading to Plesk Onyx 17.5.3 update 13 broke IMAP

Lindworm

New Pleskian
Hi,
today I upgraded from Plesk Onyx 17.5.3 update 12 to update 13. The result (like ****ing always with plesk upgrades) broke IMAP. None of my users can connect via IMAP anymore. Help please.

I used Dovecot and Postfix in update 12 and after it didn't work I removed Dovecot and replaced it with Courrier. No benefit in that, now the IMAP Connection from my client just runs into a timeout.

I do not find anything in any logfile. I am stuck. No clue anymore where to look.

How can I rollback to upgrade 12?

Bast regards ans pease help
Lindworm
 
If you receive timeout, then:

- [for a system with systemd] check service status:
# systemctl status dovecot.service
# journalctl --unit=dovecot.service


- check opened ports for dovecot;
# netstat -apt4 | grep dove
tcp 0 0 0.0.0.0: pop3 0.0.0.0:* LISTEN 11168/dovecot
tcp 0 0 0.0.0.0: imap 0.0.0.0:* LISTEN 11168/dovecot
tcp 0 0 0.0.0.0: sieve 0.0.0.0:* LISTEN 11168/dovecot
tcp 0 0 0.0.0.0: imaps 0.0.0.0:* LISTEN 11168/dovecot
tcp 0 0 0.0.0.0: pop3s 0.0.0.0:* LISTEN 11168/dovecot
#

- check from localhost that ports are open and work
# telnet localhost imap
Trying ::1...
Connected to localhost.
Escape character is '^]'.
* OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN AUTH=LOGIN AUTH=DIGEST-MD5 AUTH=CRAM-MD5] Dovecot ready.
^]
telnet> Connection closed.
#

- check from outside, that ports are opened in a firewall; it could be telnet too.
 
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