Once again guys. Should have stuck to cisco.
Well isa backend server is set up as a vpn server. Vpn client access enabled and the vpn client access is configured to use pptp.
I then publish this server on the FE box, telling isa to listen on a particular address on the external interface.
I get error 800 enable to estabish vpn connection. when monitoring the FE server is find that a connection has being routed to the BE server which is denying it.
I checked all the rules and they looked ok. any suggestions?