I have a CUPS server that seems to be unable to listen on 631. When I start the service the /var/log/cups/error_log produces:
E [19/Oct/2009:09:07:51 -0400] Unable to bind socket for address 0.0.0.0:631 - Address already in use.
When I chech the netstat, I see this:
# netstat -lnp --ip
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:32000 0.0.0.0:* LISTEN 1547/pc-app
tcp 0 0 0.0.0.0:55913 0.0.0.0:* LISTEN 1294/rpc.statd
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1055/rpcbind
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1339/sshd
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 1630/sendmail: acce
udp 0 0 0.0.0.0:659 0.0.0.0:* 1294/rpc.statd
udp 0 0 0.0.0.0:798 0.0.0.0:* 1055/rpcbind
udp 0 0 0.0.0.0:41272 0.0.0.0:* 1078/avahi-daemon:
udp 0 0 0.0.0.0:68 0.0.0.0:* 1564/dhclient
udp 0 0 0.0.0.0:55240 0.0.0.0:* 1294/rpc.statd
udp 0 0 0.0.0.0:5353 0.0.0.0:* 1078/avahi-daemon:
udp 0 0 0.0.0.0:111 0.0.0.0:* 1055/rpcbind
udp 0 0 0.0.0.0:631 0.0.0.0:* 1022/portreserve
I believe I'm expecting to see 0.0.0.0:631 to be assigned to CUPS.
cupsd.conf:
MaxLogSize 1m
LogLevel warn
SystemGroup sys root
# Allow remote access
Port 631
Listen /var/run/cups/cups.sock
# Disable printer sharing and shared printers.
Browsing Off
DefaultAuthType Basic
<Location />
# Allow remote administration...
Order allow,deny
Allow @LOCAL
Allow 10.11.101.82
Allow 10.6.101.214
Allow all
</Location>
<Location /admin>
# Allow remote administration...
Order allow,deny
Allow @LOCAL
Allow 10.11.101.82
Allow 10.6.101.214
Allow all
</Location>
<Location /admin/conf>
AuthType Default
Require user @SYSTEM
# Allow remote access to the configuration files...
Order allow,deny
Allow @LOCAL
</Location>
<Policy default>
<Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Not$
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default CUPS-Get-Devices>
AuthType Default
Require user @SYSTEM
Order deny,allow
</Limit>
<Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Curren
AuthType Default
Require user @SYSTEM
Order deny,allow
</Limit>
<Limit Cancel-Job CUPS-Authenticate-Job>
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit All>
Order deny,allow
</Limit>
</Policy>
<Policy authenticated>
<Limit Create-Job Print-Job Print-URI>
AuthType Default
Order deny,allow
</Limit>
<Limit Send-Document Send-URI Hold-Job Release-Job Restart-Job Purge-Jobs Set-Job-Attributes Create-Job-Subscription Renew-Subscription Cancel-Subscription Get-Not$
AuthType Default
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit CUPS-Add-Modify-Printer CUPS-Delete-Printer CUPS-Add-Modify-Class CUPS-Delete-Class CUPS-Set-Default>
AuthType Default
Require user @SYSTEM
Order deny,allow
</Limit>
<Limit Pause-Printer Resume-Printer Enable-Printer Disable-Printer Pause-Printer-After-Curren
AuthType Default
Require user @SYSTEM
Order deny,allow
</Limit>
<Limit Cancel-Job CUPS-Authenticate-Job>
AuthType Default
Require user @OWNER @SYSTEM
Order deny,allow
</Limit>
<Limit All>
Order deny,allow
</Limit>
</Policy>
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Wow, I didn't even think to check portreserve to be a process that was running, but that makes perfect sense.
service portreserve stop
service cups restart
did the trick.
So, all that's left is to stop PortReserve from starting in the first place, knocking the port off from CUPS using it, and read up to see if there are any disadvantages (or why portreserve wants to use 631 in the first place).
Thank you.
It seems that portreserve is supposed to be a placeholder for defined services such as cups.
Not sure whether there was an issue with cups before dealing with binding.
portreserve is waiting from a notification from cups that it is ready to start at which point portreserve is supposed to release the UDP 631 so that cups can bind to it. Either cups is not generating the notification or portreserve ignores it.
See whether your cups start script has the "portrelease cups"
https://fedorahosted.org/p
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by: arnoldPosted on 2009-10-19 at 06:44:52ID: 25605067
You seem to have an application setup portreserve that is binding to the 631 port.
https://fedoraproject.org/
See whether this utility has a configuration to either stop binding to this port or stop it from starting in the first place.