I get this error when I try to use mpich across two different nodes. My program works on a single node. I realize this is a common error but I have checked all of the issues mentioned in the FAQ and I did not find any further discussion in the archives. I followed the standard installation to /global/usr/bin and /global/usr/lib. The file system /global is automounted on the clients which have passwordless ssh configured. Running either my network test code or Intel's IMB code produced a similar error (see attached). Both codes run on a single node under mpich and run across the two nodes using openmpi. Also netpipe (using tcp sockets works fine). I tried including the LD_LIBRARY_PAT via the -genv option but that did not help. I must have some configuration issue but I do not see what. I have had previous versions of mpich/mvapich working without any trouble but I am stuck here. I would be grateful for any hints. Tony -- Tony Ladd Chemical Engineering Department University of Florida Gainesville, Florida 32611-6005 USA Email: tladd-"(AT)"-che.ufl.edu Web http://ladd.che.ufl.edu Tel: (352)-392-6509 FAX: (352)-392-9514