Why do I see the error "mpiexec: unable to start all procs; may have invalid machine names" when running a mpich2 job?

Solution Unverified - Updated -

Issue

Why do I see the error "mpiexec: unable to start all procs; may have invalid machine names" when running a mpich2 job? Below is an example:

[user1@hpc ~]$  mpirun -machinefile /home/user1/machines1 -np 8 /home/user1/cplrun/testmpi
mpiexec: unable to start all procs; may have invalid machine names
    remaining specified hosts:
        10.0.0.1 (node-00-10.pcm)

Environment

Red Hat HPC Solution

mpich2

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