Scroll up in the corr.pl and look for error messages. Things to check are
You make need to setup ssh tunnels of ports 7420 and 7426 (check) to green.ssi.swin.edu.au from “localhost”. Then set RTFC_CONTROL and RTFC_CORRELATOR to localhost. Best to edit /home/vlbi/evlbi/RtFC/setup.csh and re-login.
You can only ssh from venice, vulcan, kaputar, pavo and green