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Old 09-18-2009, 11:03 AM   #1
bzlaskar
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Registered: May 2006
Location: Bangalore, INDIA
Distribution: Fedora Core
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NFS Issue : RPC using reserved port


Hi ,
We are facing some issues with NFS mounts in our Prod RHEL 4
Linux hosts . There are around 495 NFS filer mounts in those hosts and
the kernel version is as follows.
==
grep mnt /etc/fstab | wc -l
493
uname -r
2.6.9-89.ELsmp
==
We can see the following error messages in the log file of all the
hosts.
===
Sep 17 04:02:23 iom-002 kernel: RPC: can't bind to reserved port.
Sep 17 04:02:23 iom-002 kernel: RPC: Can't bind to reserved port (98).
Sep 17 04:02:23 iom-002 kernel: RPC: can't bind to reserved port.
Sep 17 04:02:23 iom-002 kernel: RPC: Can't bind to reserved port (98).
Sep 17 04:02:23 iom-002 kernel: RPC: can't bind to reserved port.
Sep 17 04:02:23 iom-002 kernel: RPC: Can't bind to reserved port (98).
Sep 17 04:02:23 iom-002 kernel: RPC: can't bind to reserved port.
====
By checking the /etc/services file , I can see that the reserved port
is being used by some linuxconf application.
linuxconf 98/tcp # Linuxconf HTML access
My confusion is why RPC is trying to connect to a reserved port which
is already dedicated for other application. Also , looks like the
following ports are reserved for for sunrpc , then why it is trying to
use port 98.
sysctl -a | grep sunrpc
sunrpc.max_resvport = 1023
sunrpc.min_resvport = 527
One solution looks like is to increase the port range , but still the
question of connecting to port 98 is not clear to me. Please clarify
by doubts and let me know what is the good way to resolve the problem
With Thanks in Advance
--Zaman
 
Old 09-18-2009, 11:20 AM   #2
uteck
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Registered: Oct 2003
Location: Elgin,IL,USA
Distribution: Sidux, LinHES, and Mythbuntu
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I found this old post that might help;
http://osdir.com/ml/kernel.autofs/2004-10/msg00026.html
 
  


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