Cups server: printers not accessible suddenly

English Network/Internet
#1

Running Opensuse 13.1 x86_64 and for some weeks have been sharing three printers on the network from one machine.

Now suddenly no clients can see the shared printers.

With firewall disabled on clients & server, still can’t see printers.
Cupsd is running on clients & server.

Ports open on server:
Host is up (0.00013s latency).
Not shown: 996 closed ports
PORT STATE SERVICE
22/tcp open ssh
111/tcp open rpcbind
2049/tcp open nfs
8010/tcp open xmpp

Should 631 be open?

Anyone any ideas what to check?

Thanks.

#2

A little more digging revealed this in the CUPS error log, which I can provoke by trying to restart cupsd:

E [03/Feb/2014:19:09:11 +0000] Browsing=1
E [03/Feb/2014:19:09:11 +0000] BrowseLocalProtocols=1
E [03/Feb/2014:19:09:11 +0000] BrowseRemoteProtocols=1
E [03/Feb/2014:19:09:11 +0000] BROWSE_CUPS=1
E [03/Feb/2014:19:09:11 +0000] Browsing=1
E [03/Feb/2014:19:09:11 +0000] BrowseLocalProtocols=1
E [03/Feb/2014:19:09:11 +0000] BrowseRemoteProtocols=1
E [03/Feb/2014:19:09:11 +0000] BROWSE_CUPS=1
E [03/Feb/2014:19:09:11 +0000] Unable to bind socket for address 0.0.0.0:631 - Address already in use.
E [03/Feb/2014:19:09:11 +0000] Unable to bind socket for address [v1.::]:631 - Address already in use.

Which led me to try to find who’s bound the socket. I may have the wrong idea about investigating this but I stopped cupsd and tried:

**lsof -i :631

**[FONT=verdana]Which gave:

[/FONT]~> lsof -i :631
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
systemd 1 root 21u IPv4 15396 0t0 TCP localhost:ipp (LISTEN)
systemd 1 root 32u IPv6 15397 0t0 TCP localhost:ipp (LISTEN)
systemd 1 root 33u IPv4 15398 0t0 UDP localhost:ipp
systemd 1 root 34u IPv6 15399 0t0 UDP localhost:ipp

So now I’m stuck (again). Is this right? What’s systemd and why has it grabbed port 631?

#3

Please try this thread: https://forums.opensuse.org/showthread.php/494781-Cannot-access-CUPS-server-after-update

It may take some time to find out wha to do (and what not) exactly. The thread does not conclude with a clear step by step solution.>:)

#4

I’m going to suggest that you try the updates from the printing repo

http://download.opensuse.org/repositories/Printing/openSUSE_13.1/

as suggested in the bug report

https://bugzilla.novell.com/show_bug.cgi?id=857372#c75

Socket-activation has been disabled in the updates with cups.service now modified accordingly.

I added the repo with zypper and updated from it. I’ve done the same with a CUPS print server I had set up, and all is working fine.

#5

How did you shared printer on openSUSE 13.1? I’m trying for about a week without luck. I’m new to suse, any clue would be appreciated.
Even with firewall not running port 631 is not accesbile after some time. Could you at least tell me how to open port 631 properly?
Is there any additional things to do except that?

#6

Try updating CUPS via the printing repo. Without socket activation, cups.service now looks like this

[Unit]
Description=CUPS Printing Service
After=network.target

[Service]
ExecStart=/usr/sbin/cupsd -f

[Install]
WantedBy=multi-user.target

and cupsd will stay active, and listening. (All that remains is to make sure that /etc/cups/cupsd.conf is configured correctly each end.)

If you require further help, I suggest you start a new thread with descriptive title.