IMAP Clients Unable to connect on IMAP port 143.

  • Document ID:3057340
  • Creation Date:05-Oct-2006
  • Modified Date:16-Mar-2012

Environment

Novell SUSE Linux Openexchange Server 4.1

Situation

IMAP Clients Unable to connect on IMAP port 143.
IMAP Clients are able to connect on the secure port.
Able to telnet on port 143 but IMAP commands do not work.

Resolution

Use the command to see what is holding that port open:
netstat -tupan|grep 143|grep LISTEN
You should see a output similar to:
tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 886/master
If you do not see master process listening, then kill the process which is listening on port 143 and restart Cyrus.