This is the knfs FAQ page.  

Q: I receive the following mesaages when using knfsd, what's up?

  Apr  7 16:18:25 host kernel: lockd: failed to monitor 192.168.34.20
  Apr  7 16:28:00 host kernel: nsm_mon_unmon: rpc failed, status=-43
 
A: Please run the 'statd' daemon on both the server and the client.
   Statd can be found in the knfsd user package.