@salem696 Archer C6 v4 doesn't support VPN server as seen from its tech specs.

@duckware I saw in other threads others mentioned they can solve this issue by assigning a static IP address for the router. You can check this thread. Have you turned off the DHCP Server? Try...

@asnikifor WDS may not always work due to the fact that different manufacturers may use different WDS standards, and they may not be compatible with each other, terziyski explained this in the...

@Rayespe It can be the same as the main router, but you will see two networks with the same name and it would be hard for you to distinguish which one is the main and which is the AP.

@Enesha Port 22 should be opened by default for the Tether app as stated in this FAQ. So you cannot open it for other services or devices in the local network. How about 32400, is it opened...

@NoTechno Have you tried all of the suggestions provided by Samsung? Try to change the SSID and channel on the TP-Link router as well as per this guide, you can leave the network without a password...