Quoting Matthew B. Wood,

> + Linux seems to be very picky about its port usage vis a vis NFS:

> Jun 24 12:28:14 vex nfsd[95]: NFS request from [client IP address] 
> originated on insecure port, psychoanalysis suggested 

A lot of systems require the use of a reserved port. In the BSD implementation,
this is not the default, but you have to specify it using '-P'.

- Frank