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Alex Granovsky
gran@classic.chem.msu.su

>Permission denied, please try again.

>Permission denied, please try again.

>Permission denied (publickey,password).

these messages come from ssh that cannot log on to the remote node.

>p0_15919:  p4_error: Child process exited while making connection to remote process on mercury01: 0

and this is from MPICH that fails to launch remote processes via ssh

So clearly you have ssh-related problems.
Check if you indeed can login from compute node to another
compute node using passwordless ssh.

regards,
Alex Granovsky