Can't mount nfs filesystem

I have just a created a tomsrtbt floppy (version 2.0.103) in order to try to 
get some data of a laptop with a dead graphics card (screen and external 
monitor don't work), it seems to have been created fine and recognises my 
pcmcia card. But when I try to mount an nfs drive on my server it comes up 
with the following errors:

# mkdir /tmp/mount
# mount -t nfs <my server ip address>:/path/to/nfs/share /tmp/mount
nfs warning: mount version older than kernel
portmap: RPC call returned error 5
portmap: RPC call returned error 5
lockd_up: makesock failed, error=-5
portmap: RPC call returned error 5

Any idea what is causing this or what I could do to resolve the problem?

Kees