issue with starting vnc on saiwaves

The one-line script for starting the VNC service on localhost with the required port and bit-depth would not work when I logged in with putty, but was working when I ssh'ed in with Linux! Felt the issue was with the tunnels I had defined in putty. Starting the session without the tunnels, the script works fine. If the tunnels are opened from another instance of putty also, the script "hangs". Some sort of port conflict, I guess.