Can't add a static port mapping in my c# application

Question

I\'m trying to add new static port mapping in my c# application. Because my application runs as a server and i want its to listen on the port 8000.

NATUPNPLi         


        

Answer 1

You need to set mappings to a new instance:

For example:

var mappings = new List();

Then you can call:

mappings.Add(8000, "TCP", 8000, "192.168.1.100", true, "Local Web Server");

From your edit:

upnpnat.StaticPortMappingCollection; // this is your problem.  

The collection is coming back as null. Therefore you cannot add to the collection.

You may have to do:

NATUPNPLib.IStaticPortMappingCollection mappings = new StaticPortMappingCollection();

From Codesleuth's comment:

I believe the answer is that his router isn't configured as a UPnP gateway, or that he has no permissions. The StaticPortMappingCollection is null if either of those cases are true. I suggest you edit this into your answer as you've got the right reason for the error anyway. Checking for null first is the only way to deal with the error