Comment 6 for bug 146252

I've stumbled upon this bug as well (Hardy), rpc.statd seems to like port 631...
Some limited testing suggests the option -o (--outgoing--port) is ignored by rpc.statd:

# LANG=en_GB dpkg -l nfs-common
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-f/Unpacked/Failed-cfg/Half-inst/t-aWait/T-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name Version Description
+++-==============-==============-============================================
ii nfs-common 1:1.1.2-2ubunt NFS support files common to client and serve

# /sbin/rpc.statd -p 4000 -o 4001
# ps auwwx | grep statd
statd 27434 0.0 0.0 1900 704 ? Ss 14:56 0:00 /sbin/rpc.statd -p 4000 -o 4001
# netstat -upnl | grep statd
udp 0 0 0.0.0.0:898 0.0.0.0:* 27434/rpc.statd
udp 0 0 0.0.0.0:4000 0.0.0.0:* 27434/rpc.statd