Question

CUPS Service error on Port 631

Asked by: FLee_TA

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-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-$
    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-Current-Job Hold-New-Jobs Release-Held-New-Jobs Deactivate-Printer Activate-$
    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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Asked On
2009-10-19 at 06:19:14ID24823427
Tags

CUPS 1.4.2

,

Fedora 10

,

port 631

Topics

Linux Printing

,

Linux Networking

,

Linux

Participating Experts
1
Points
250
Comments
3

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Answers

 

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/wiki/Features/Portreserve

See whether this utility has a configuration to either stop binding to this port or stop it from starting in the first place.

 

by: FLee_TAPosted on 2009-10-19 at 06:57:44ID: 31642881

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.

 

by: arnoldPosted on 2009-10-19 at 07:12:41ID: 25605279

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/portreserve/browser/README

20120131-EE-VQP-002

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