Q: I use ssh to launch the command remotely (without login). Everything works fine, but I don't see the cplex output messages. The error messages says:
*** Open logfile error: (R=0) FN="/dev/tty" *** Msg=Success *** Logging to standard output
With an interactive session, I get the cplex messages without problems.
By default GAMS wants to write to the console (/dev/tty) which does not exist for remote execution. The solution would be to log to stdout. You do that by adding parameter LogOption=3 (or short lo=3) to the GAMS command line.