Jul 22 23:53:35 serverNameXXX: svc: unknown version (0 for prog 100003 nfsd)

Question

nfs server went down this morning, and it seems that these messages have been appearing in the logs since yesterday. I don't think any changes have been made to the config recently.

Jul 22 22:44:50 serverNamexxx kernel: svc: unknown version (0 for prog 100003 nfsd)
Jul 22 22:50:50 serverNamexxx kernel: svc: unknown version (0 for prog 100003 nfsd)
Jul 22 22:57:50 serverNamexxx last message repeated 2 times

rpcinfo -p shows the nfs process as having prog id 100003;

100003    2   udp   2049  nfs
100003    3   udp   2049  nfs
100003    4   udp   2049  nfs
100003    2   tcp   2049  nfs
100003    3   tcp   2049  nfs
100003    4   tcp   2049  nfs

Answer 1

Apparently rpcinfo -p sends version 0 nfsd packets, so that is what is causing the warning.

I am using check_rpc plugin for nagios, and that is where the requests are coming from.