pbs_connect error when running mpiexec jobs with PBS

[Piotr Siwczak]

Hi,

Recently I've been experiencing a strange behaviour from my 'pbs-enabled' 
mpiexec. All mpi jobs quit with the following information:

mpiexec: Error: get_hosts: pbs_connect: Access from host not allowed, or 
unknown host

However, in logs I can see that the pbs scheduler accepts submitted job 
and sends it to a mom at one of my cluster nodes. Having been processed on 
pbs_mom, job exits with error status=1.

On the other hand, jobs submitted with mpirun (mpich2) outside pbs work 
perfectly.

Anyone knows reason for such behaviour?

Cheers,
Piotr