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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)

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  • It seems to be a feature of the way that systemd works - see for example init(pid=1) listen on port 9418(git) - would love to hear a real answer though Commented Oct 26, 2016 at 20:57
  • I noticed this on my machine too. How is this a feature? - just seems like a vector of attack to me, and I have these installed and it stills show 1/init, time for unix.stackexchange.com/questions/218933/… Commented Oct 23, 2018 at 5:37

2 Answers 2

Reset to default
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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
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  • 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 ? Commented Oct 27, 2016 at 12:27
  • Yes it will comment out lines with port 143 Commented Oct 27, 2016 at 12:29
  • I have test it on my debian jessie . Can you try it ? Commented Oct 27, 2016 at 12:31
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    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. Commented Oct 27, 2016 at 12:37
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    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. Commented Oct 27, 2016 at 13:39
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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...

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  • Do you mind explaining this magic. What does mask dovecot.socket do ? Why stopping socket and not start socket ? Commented Mar 9, 2019 at 11:32

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