RPC Can't bind to reserved port - Reserved port exhaustion in RHEL 4
Issue
At times user cannot get their home directories automounted because the port pool is exhausted (sunrpc.min_resvport and sunrpc.max_resvport)
The following is observed in /var/log/messages:
Oct 7 13:43:33 client kernel: RPC: Can't bind to reserved port (98).
Oct 7 13:43:33 client kernel: RPC: can't bind to reserved port.
Oct 7 13:43:33 client kernel: RPC: error 5 connecting to server server
Oct 7 13:43:33 client automount[8548]: >> mount: server:/vol/dev_users/se69639: can't read superblock
Oct 7 13:43:33 client automount[8548]: mount(nfs): nfs: mount failure server:/vol/dev_users/se69639 on /home/se69639
Oct 7 13:43:33 client automount[8548]: failed to mount /home/se69639
Environment
- Red Hat Enterprise Linux 4
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- NFS
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