Spurious "printer added" messages

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1

Every 5 minutes (per journalctl), I get a “printer added” message.

This has been happening since I got a new router, a tp-link Wi-Fi 6E (AXE75), but I have not noticed any other misbehavior.

While this doesn’t seem to affect anything, it is rather distracting.

The journalctl output is below.

I have been unable to find a way to stop this.

Any ideas?

Jan 07 00:01:03 fedora43 audit[506274]: AUDIT2304 pid=506274 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:cupsd_t:s0-s0:c0.c1023 msg='printer=Canon_TR8500_series uri=ipp://300C27000000.local:631/ipp/print banners=none,none range=unknown exe="/usr/bin/cupsd" hostname=fedora43 addr=xxxx::xxxx::xxxx::xxxx::xxxx terminal=? res=success'
Jan 07 00:01:03 fedora43 cupsd[506274]: REQUEST localhost - - "POST / HTTP/1.1" 200 253 CUPS-Create-Local-Printer successful-ok
Jan 07 00:01:04 fedora43 audit[506274]: AUDIT2304 pid=506274 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:cupsd_t:s0-s0:c0.c1023 msg='printer=Canon_TR8500_series uri=ipp://300C27000000.local:631/ipp/print banners=none,none range=unknown exe="/usr/bin/cupsd" hostname=fedora43 addr=xxxx::xxxx::xxxx::xxxx::xxxx terminal=? res=success'
Jan 07 00:01:04 fedora43 cupsd[506274]: REQUEST localhost - - "POST / HTTP/1.1" 200 253 CUPS-Create-Local-Printer successful-ok
2

Disable UPnP on the router, or maybe another printer related setting on the router?

3

This must be related to services discovery over mDNS:

Remove those packages or mask the relevant services:

sudo systemctl mask cups-browsed.service --now
sudo systemctl mask avahi-daemon.service --now
4

The solution was

Thanks!

But

produced

Then, after attempting a print job, journalctl showed this:

and nothing was printed.

Oddly,

Produced

But printing now works, without the annoying message.

Thanks again!

5

Is this the proposed solution?

Running the command sudo systemctl mask cups-browsed.service --now will completely disable the CUPS-browsed service, preventing it from starting.

Implications of Masking cups-browsed:

  1. Automatic Printer Discovery: You will lose automatic printer discovery for network printers. This means that any network printers will not be added automatically to your system.
  2. Manual Configuration: You will need to manually configure any network printers through the CUPS web interface or command line.
  3. Potential Impact on Shared Printers: If you rely on shared printers in a networked environment, those will not be automatically detected, and you’ll need to add them manually.
6

Cups will advertise shared printers to the avahi server, and AirPrinte/Mopria/ipp-everywhere printers do that as well. These will be auto-discoverd by other computers running cups without the help of CUPS-browsed.