If no port is specified, assume port 80. Patch from Karthik.
If no port is specified, assume port 80. Patch from Karthik.

svn path=/trunk/Mono.Nat/; revision=107858

OpenRA/Mono.Nat,OpenRA/Mono.Nat,nterry/Mono.Nat,mono/Mono.Nat,lontivero/Open.NAT,nterry/Mono.Nat,mcatanzariti/Open.NAT,lovewitty/Open.NAT