When I do netstat -tanup as root on my Debian host, process 1/init is displayed for port 993. How is this possible ? I never saw such behavior.

The command systemctl list-sockets shows the correct service dovecot associated to port 993.

EDIT: I noticed another strange thing: Sytemd reports that davecot is listening on port 143 (imap) and dovecot is configured to not listen on port 143. I get a warning in the logs about that: dovecot: master: Error: systemd listens on port 143, but it's not configured in Dovecot. Closing.: 2 Time(s)


By default dovecot run pop , imap , pop3 and imaps on the following ports:

110: pop
143: imap
995: pop3s
993: imaps

install dovecot-pop3d then copy dovecot.socket to /etc/systemd

sudo cp /lib/systemd/system/dovecot.socket /etc/systemd/system/
sudo systemctl reenable dovecot.socket

Modify dovecot.socket:

sudo sed -i '/:143$/s/^/#/' /etc/systemd/system/dovecot.socket

Restart the service:

sudo systemctl stop dovecot.service
sudo systemctl start dovecot.socket
sudo systemctl daemon-reload

Check the status:

sudo systemctl status dovecot.socket
  • Why do you tell me to install dovecot-pop3d if I only need and use imaps ? Does the sed line simply comment out lines with port 143 ?
    – chmike
    Oct 27 '16 at 12:27
  • Yes it will comment out lines with port 143
    – GAD3R
    Oct 27 '16 at 12:29
  • I have test it on my debian jessie . Can you try it ?
    – GAD3R
    Oct 27 '16 at 12:31
  • 1
    I'll try it. It seam more appropriate to create a symbolic link ln -s /lib/systemd/system/dovecot.socket /etc/systemd/system as this is what has been done for ssh I see.
    – chmike
    Oct 27 '16 at 12:37
  • 1
    Ok. It works. I overwrote the /lib/systemd/system/dovecot.socket file with the commented out lines with 143 ports. Then the reeanable was required because it doesn't simply create a link. Apparently systemd updates its state. After that netstat showed dovecot instead of init. Don't know if the systemctl daemon-reload is required.
    – chmike
    Oct 27 '16 at 13:39

Without modifying files:

sudo systemctl stop dovecot.service
sudo systemctl stop dovecot.socket
sudo systemctl mask dovecot.socket
sudo systemctl start dovecot.service

and enjoy netstat -tanup ouput...

  • Do you mind explaining this magic. What does mask dovecot.socket do ? Why stopping socket and not start socket ?
    – chmike
    Mar 9 '19 at 11:32

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