I have done some tests and have found a solution. Please try it out.
Edit the file (with sudo):
adding a line
in the "[Socket]" section. The file should look like this then:
Now make sure that this does not produce any editor backup files, like
/lib/systemd/system/cups.socket.backup. Remove such files now.
Now restart systemd with the command
sudo systemctl daemon-reload
Now systemd does not only restart CUPS via the domain socket but also
via port 631, meaning that it also gets started when trying to access
via the web interface (or any other application which accesses only via
Please try it out.
If you do not want to wait everytime until CUPS stops by itself for
doing the tests, you can stop it with
sudo systemctl stop cups
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cups hang after a while
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