Hi all, I am trying to run the example cpi.exe across 2 amazon ec2 instances running windows. I have different problems depending on the channel I choose. If I try nemesis, I get the following error: Fatal error in MPI_Init: Other MPI error, error stack: MPIR_Init_thread(392).................: MPID_Init(139)........................: channel initialization failed MPIDI_CH3_Init(38)....................: MPID_nem_init(196)....................: MPIDI_CH3I_Seg_commit(366)............: MPIU_SHMW_Hnd_deserialize(324)........: MPIU_SHMW_Seg_open(863)...............: MPIU_SHMW_Seg_create_attach_templ(763): unable to allocate shared memory - OpenFileMapping The system cannot find the file specified. If I try to use shm, cpi.exe uses 100% of the processors on both machines, but makes no progress and I have to cancel the job. I am attaching logs from smpd from both machines from the runs with nemesis and shm. I don't have any experience with mpich, so I have no idea what the problem is. Any guidance would be appreciated. Thanks