As suggested by the Arch wiki, I used the
# HostNameLookups Double
option. However, that resulted in following error message: IP lookup failed - connection from localhost closed!
and I wasn't able to add printers via the CUPS web interface (internal server error)
It seems there is an outstanding bug with respect to the HostNameLookups: http://www.cups.org/str.php?L4070+Qversion:%20-feature
Device node permissions
I got a problem after update of/ and foomatic. My printer not working anymore.
So I first check possible problems and read section Device node permissions. It's recommended to verify that permissions are 660. It was my case so I am looking to find another solution.
After a long time and read I was back to this section. I read also section below Device node permission troubleshooting. As my conf was with well permission I don't really read all carefully. It was the 3rd/4th time before I see the note about 666 permissions. I tried this and it's solved my problem.