I had succesfully in the past used TCP mapping to map http://myserver.com:2526 to http://10.0.16.2:3000 which is a webclient service over another subnet. This was working fine but since upgrading (may be before) to version 6.0.3 it seems not to work any more.
On discovering this I created a redirect in the ENS Firewall Ports Secrity and that is working like a charm. I am confused as to the use for the TCP mapping and its functionality. Can some one direct me to a doc or explain the difference.