Gmod portfoward (invalid port range)

Whenever i try to portforward gmod whenever i click save it says (invalid port range)

This happened ever since i got a new router. All my other games port fine except for this one.

What port are you trying to forward? It should be 27015 by default.

Have you set the start/end range of the port to 27015?

Yes i have, Multiple times and it still said invalid port range

send us a picture of the interface

removed pic for safety purposes

Sorry my fraps wasnt taking a picture, had to use my phone.

try 27014-27016?

It worked I’m trying it right now

Port forward the range 27000-27030 UDP+TCP

Thanks, I’ll keep both ports in my notes. I used the first one and it worked. Thanks for all the help!