I am making a cluster for Francis Marion University and can't figure out how to get rid of this error. I understand what it is stating. A proxy is created but it can't find it once created. I think it isn't creating a proxy. The other errors seem to roll off errors from the proxy error. I tried looking up PMI but could find anything relative. I get this error every time I try to use mpirun -np 6 ./hello I have 6 ibook g3's that have powerpc processors and a headnode that is a tower that runs intel. I installed mpich2 on the headnode and on one of the slaves. I copied the slave's mpich to the others. I am able to ssh without any password to the slaves using rsa. my HYDRA_HOST_FILE environment variable is /mpich2/hosts [mpiexec@headnode] HYD_pmcd_pmiserv_proxy_init_cb (./pm/pmiserv/pmiserv_cb.c:529): cannot find proxy with ID 33554432 [mpiexec@headnode] HYDT_dmxu_poll_wait_for_event (./tools/demux/demux_poll.c:77): callback returned error status [mpiexec@headnode] HYD_pmci_wait_for_completion (./pm/pmiserv/pmiserv_pmci.c:196): error waiting for event [mpiexec@headnode] main (./ui/mpich/mpiexec.c:325): process manager error waiting for completion I am able using c3 to run cexecs 'date' and they all return a date no problem. my /mpich2/hosts looks like: node01 node02 node03 node04 node05 node07 The headnode has two Ethernet ports one going to the internet and the other to a switch with the slaves connected to them. They are all running Debian Linux 6.0.6. Help would be much appreciated. Sincerely, Will Dixon