When I try to run Dakota in parallel, the system hangs/aborts.

This problem can result from not being able to open a remote/secure shell (rsh/ssh) without a password challenge. MPI by default uses rsh, but can be configured to use ssh. Read the man pages for the shell in use and set up the necessary files (e.g., .rhosts, authorized_keys) so that you can open a shell on the target machine without a password challenge. Parallel Dakota runs should then work.

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