Comment 15 for bug 305030

I have a similar problem with IPP printing that requires authentication, and I think it's the same bug (or related at least).

I set up the printer (IPP) and the first time I printed I was prompted for a password, but it worked.
After this, however, I got the authentication error described above.

After som digging, I have it kind of working by doing this:
1. Changing the URI in /etc/cups/printers.conf from
DeviceURI ipp://<ipp-printer-server-adress>:631/printers/printer1
to
DeviceURI ipp://USER:PASSWORD@<ipp-printer-server-adress>:631/printers/printer1
2. Removed myself from the lpadmin group.

Now I can print using lpr or Acroreader (which uses lp/lpr), but I still can't print from Evince!

Adding the USER:PASSWORD in system-config-printer does not work, but manually editing /etc/cups/printers.conf did.
As a first try, I commented out the "AuthInfoRequired" line, but it crept back in when I restarted Cups!

Another thing which may or may not be related is that I can't change the printer settings for this printer that require authentication. [And yes, I tried it while still begin in the lpadmin group...]
If I use the Cups web interface, it works however. But it's not very convenient...