GRE port forward problem with changing protocol
When changing the protocol on a port forward from one with ports to GRE, the port is retained where it should be wiped out.
One way to replicate:
1) Duplicate a TCP port forward.
2) Change protocol to GRE.
4) see it has <local-port> from former TCP config in there that should have been removed upon changing to GRE (or any protocol that doesn't have ports).