I'm using D-Link DGL-4300 and my router has security now ( i think something like WPA security) and now the port checker is saying my ports are closed... They were opened fine until I added security to my router, what must I do?
You can use what is commonly referred to as port forwarding. You specify specific port to open and the private IP address that you want the data forwarded to. This is called "Gaming" in your router's product manual and is found on page 33.
Or you can use port triggering, which requires outbound data to be sent on specified port(s) before opening other specified port(s) for the returned inbound data. It is found on page 32.
Your product manual can be found here in D-Links support pages.
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