Sorry, just found out about the "--debug-daemons" option, which allowed me to google a meaningful error message and find the solution in the archives of this list.
For the record, the problem was that the "orted" being launched on the remote node is the one from the system-wide MPI install, not the one in my home dir. It seems that "-x PATH" does not affect the search for "orted"; would it make sense that "-x FOO" adds also a " -o SendEnv=FOO" in the "ssh remote-node orted" invocation? Best regards, Riccardo
