I am a newbie to dovecot but not postfix and centos
I created a new VM with Centos 8 and installed dovecot and postfix. Postfix is working fine but dovecot rejects connections from anything but the local machine.
Locally
Trying 10.10.100.157... Connected to 10.10.100.157. Escape character is '^]'. * OK [CAPABILITY IMAP4rev1 LITERAL+ SASL-IR LOGIN-REFERRALS ID ENABLE IDLE STARTTLS AUTH=PLAIN] Dovecot ready.
Machine on same subnet. Windows, Linux, etc. Doesn't seem to matter
telnet 10.10.100.157 143 Connecting To 10.10.100.157... Could not open connection to the host, on port 143: Connect failed
I made sure the iptables are empty so it doesn't seem to be a firewall issue
I put some LOG statements in the iptables and it showed the connect packet arriving and the response packet was ICMP type 3 code 13.
Any ideas?
Roy