Symptoms
Dovecot is unable to start and we cannot access webmail.
Cause
Dovecot cannot open port 995, which prevents Webmail access or the service from starting.
CONFIG_TEXT: Startup Log
May 30 02:53:12 hostname systemd[1]: Started Dovecot Imap Server.
May 30 02:53:12 hostname dovecot[5423]: Error: service(pop3-login): listen(*, 995) failed: Address already in use
May 30 02:53:12 hostname dovecot[5423]: master: Error: service(pop3-login): listen(*, 995) failed: Address already in use
May 30 02:53:12 hostname dovecot[5423]: master: Fatal: Failed to start listeners
May 30 02:53:12 hostname dovecot[5423]: Fatal: Failed to start listeners
May 30 02:53:12 hostname systemd[1]: dovecot.service: main process exited, code=exited, status=89/n/a
May 30 02:53:12 hostname systemd[1]: Unit dovecot.service entered failed state.
May 30 02:53:12 hostname systemd[1]: dovecot.service failed.
dovecot has failed. Contact your system administrator if the service does not automagically recover.
Resolution
Verify which service is running on the Dovecot port, and disconnect or stop the running service on this port.
# netstat -plan |grep :995
tcp 0 0 $IP_ADDR:995 $IP_ADDR:2049 ESTABLISHED -v
# ss -p|grep pop3
tcp ESTAB 0 0 $IP_ADDR:pop3s $IP_ADDR:nfs
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