If you believe this might be an issue with the way that ssh is setup for your users on the cluster, you can try using the Expect script we provide with the Intel MPI Library installation. It's called sshconnectivity.exp and it should be located in the original directory where the contents of the l_mpi_p_3.2.1.009 package were untarred. Of course, you would need to install the
expect software first in order to run the script.
If you do decide to go this route, the script would setup secure shell connectivity across the entire cluster for the particular user account for you. To run it, all you have to do is provide a list of hosts:
$ ./sshconnectivity.exp machines.LINUX
machines.LINUX contains the hostnames of all nodes on the cluster (including the head node), one per line.
This is just another option, if you're stuck. Let us know how it goes.