I have installed the Mail server from the App Center on slave system in the UCS domain. I have enabled connections on Proxmox firewall from my local network and between the master and slave systems which are both on the same and latest UCS version, and hosted as Proxmox virtual machines. When connecting to the mail server from my local network or via webmail on slave, access is however denied.
I have followed the manual https://docs.software-univention.de/manual-4.4.html#mail::general and video tutorial https://www.youtube.com/watch?v=XBWWCT9vrCY.
Here are captures from the logs of the slave system.
Aug 10 15:08:53 mailserver PAM-univentionmailcyrus: Failed to connect to LDAP server ds1:7389 Aug 10 15:08:53 mailserver PAM-univentionmailcyrus: Failed to connect to the configured LDAP servers
Aug 10 15:08:53 mailserver kernel: [208799.298059] auth: segfault at 18 ip 00007f9ad34661cd sp 00007fffa9b42390 error 4 in libc-2.24.so[7f9ad33ef000+195000] Aug 10 15:08:53 mailserver dovecot: auth: Error: auth worker: Aborted PASSV request for firstname.lastname@example.org: Worker process died unexpectedly Aug 10 15:08:53 mailserver dovecot: auth-worker: Fatal: master: service(auth-worker): child 23803 killed with signal 11 (core dumps disabled)
10.08.20 15:28:21.349 LDAP ( PROCESS ) : connecting to ldap://master.example.com:7389 10.08.20 15:28:21.351 LDAP ( ERROR ) : start_tls: Connect error 10.08.20 15:28:21.351 LISTENER ( WARN ) : can not connect to LDAP server master.example.com:7389 10.08.20 15:28:21.351 LISTENER ( WARN ) : can not connect any server, retrying in 30 seconds
So far I have tried to
• Reboot both systems.
• Rejoin the slave system.
• Resync dovecot and some other services (on both slave and master).
Obviously, the listener log suggests an error related to start_tls. On both systems I have Let’s Encrypt installed and no customizations made.
Any suggestions, what I should try next?