I posted this to an old thread, but thought it best to start a new one as the original topic is a bit different. Hope that's OK... I'm having trouble with a port forward. I have two Hikvision NVR's, one on router #1 and one on router #2. The second router is connected by a LAN port, so it should be acting just as a switch. I've applied Port forwarding rules in the first router to open ports 81, 8001 and 10554 for the 2nd NVR. (Ports for the 1st NVR are 80, 8000 and 554) Of the three, Port 81 is now open, but for some reason 8001 and 10554 remain closed. Here is a screenshot showing the 2nd Hikvision NVR network configuration, now showing a message for the two ports that won't open. Message shows "Inactive (the external port has been used)" Should the numbers for External port and Port not be the same?