It's a problem in your ssh settings not MPICH.
Make sure communication between all your nodes is well setup before running an MPI program.
Some more hints are given in our FAQ page https://wiki.mpich.org/mpich/index.php/Frequently_Asked_Questions#Q:_My_MPI_program_aborts_with_an_error_saying_it_cannot_communicate_with_other_processes

--Halim
www.mcs.anl.gov/~aamer

On 3/3/16 10:40 PM, sanjesh pant wrote:

Hi Sir,
         As per your suggesstion got from mail , I used it to execute
program but still there is a problem .
Now I am having permission problem.
  Problem : Permission denied (publickey, gssapi-keyex, gssapi-with-mic).

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