validating lsf cluster profile on multiple nodes

I installed r2014a on a linux cluster (shared file system). I created a LSF cluster profile. When I set the number of worker to 16 (all workers will start on the same node) validation works fine. lsfWrapMpiexec.sh outputs something like:

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"lsgrun -p -m NODE1 mw_smpd -s ...."

"mw_mpiexec"

"lsgrun -p -m NODE1 mw_spmd -shutdown"

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Everything is executed fine.

However, when I change the number of workers to 32 (requiring two nodes) validation doesn't work. lsfWrapMpiexec.sh outputs something like:

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"lsgrun -p -m NODE1 mw_smpd -s ...."

"lsgrun -p -m NODE2 mw_smpd -s ...."

Remote task 1 executed on host NODE2 (PATH/mw_smpd) User permission denied

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the first mw_smpd is executed fine, but the second causes the user permission denies error. That doesn't make any sense.

Passwordless ssh is setup correctly, all permissions are correct. Why do I get this error