IMAP/POP3 fails with Plesk Premium Email: [email protected] seems to be in use by another Erlang node

Symptoms

• IMAP and POP3 connections to a Plesk server with Plesk Premium Email don't work

• Guam (Plesk Premium Email's frontend for IMAP/POP3) fails to start with this error in /var/log/syslog or /var/log/messages:

  epmd[491]: epmd: node name already occupied kolab_guam
  guam[1198097]: Protocol 'inet_tcp': the name [email protected] seems to be in use by another Erlang node

Cause

The process epmd is running and prevent Guam from starting.

Resolution

Terminate epmd and start Guam.

1. Connect to the server over SSH

2. Run this command:

   # ps auxwwf | grep -i [e]pmd | tr -s ' ' | cut -d' ' -f2 | xargs kill -9 && service guam start