Description of problem: I (tried to) turn off IPv6 on my rawhide system (due to issues with name severs, sigh), and I noticed that printing (say, from firefox) stopped working. (I unchecked all IPv6 boxes in s-c-network, added "install ipv6 /bin/true" and rebooted). Checking /var/log/cups/error_log, I noticed: E [20/Aug/2008:06:14:08 -0700] Unable to open listen socket for address ::1:631 - Address family not supported by protocol. I [20/Aug/2008:06:14:08 -0700] Listening to /var/run/cups/cups.sock on fd 4... and [tbl@localhost ~]$ curl http://localhost:631 curl: (7) couldn't connect to host [tbl@localhost ~]$ Firewall settings are fine. Noticed also that /etc/hosts only has entry for '::1' for localhost: # Do not remove the following line, or various programs # that require network functionality will fail. ::1 localhost.localdomain localhost [tbl@localhost ~]$ Adding an IPv4 entry for localhost and restarting cups "makes this work for me": # Do not remove the following line, or various programs # that require network functionality will fail. 127.0.0.1 localhost.localdomain localhost ::1 localhost.localdomain localhost [tbl@localhost ~]$ and I [20/Aug/2008:07:06:58 -0700] Listening to 127.0.0.1:631 (IPv4) I [20/Aug/2008:07:06:58 -0700] Listening to /var/run/cups/cups.sock (Domain) Should the above (i.e., "hard removal of IPv6") work? Version-Release number of selected component (if applicable): cups-1.3.8-4.fc10.i386 How reproducible: Every time Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
(In reply to comment #0) > Checking /var/log/cups/error_log, I noticed: > E [20/Aug/2008:06:14:08 -0700] Unable to open listen socket for address ::1:631 > - Address family not supported by protocol. > I [20/Aug/2008:06:14:08 -0700] Listening to /var/run/cups/cups.sock on fd 4... So it's listening on the UNIX domain socket. > [tbl@localhost ~]$ curl http://localhost:631 > curl: (7) couldn't connect to host > [tbl@localhost ~]$ Well, it isn't listening on the IPv4 port; it hasn't been told to. It's listening on port 631 of 'localhost', whichever addresses that happens to resolve to -- in your case, the IPv6 localhost address. It's a known bug in GTK+ that the print dialog (as used by e.g. Firefox) doesn't use the UNIX domain socket: bug #455742. I expect you'll find that 'lp' etc work fine. :-) There's no CUPS bug here.