port forwarding not working

Hi,

I am trying since 3 days ago to create a port forwarding rule trough nostnet.pt router admin panel without success.

I always get the same error, saying that I an error occured and i should try again later.

I already read many related topics on the forum znd tried as much as I could do : factory reset the router, simply reset the router, unplug the router, change dhcp rules, change the local Ip of my computer ... without success.

I called the support for help, and they said to call 16991. From what I've read until, I know i'll wait for a long time to get a very probable bad help, and finally pay the call.

I have a giga router 

help me please