Unable to log in to webmail with enabled Plesk Premium Email: Could not connect to localhost:143: Connection refused

Symptoms

• Plesk Premium Email is installed and enabled on a Plesk server.

• When logging in to webmail, one of the following error messages appears:

  PLESK_INFO: Connection to storage server failed

  ---

  PLESK_INFO: Error connecting to mail server.

• It is not possible to connect to port 143 from the server:

  # telnet localhost 143

  Trying ::1…
  telnet: connect to address ::1: Connection refused
  Trying 127.0.0.1…
  telnet: connect to address 127.0.0.1: Connection refused

• Dovecot is running on port 9143 instead of 143:

  # netstat -plutn | grep 143

  tcp 0 0 127.0.0.1:9143 0.0.0.0:* LISTEN 13103/doveco

Cause

The guam service (the front-end IMAP and IMAPS service when Plesk Premium Email is used) is stopped.

Resolution

1. Connect to the Plesk server via SSH.

2. Restart the guam service:

   # service guam start

3. Enable the guam service to make it starting automatically after system reboot:

   # systemctl enable guam

Alternatively, remove the extension from the server, if Plesk Premium Email is not used.