I have been using an eyemax HX-04 for several years with no issues. I could view the cameras from PC and iPhone via internal DVR address or external PC address using i-Smart Viewer. Then it stopped working. My pc external address had changed. I hadn't looked at system in more than a year so thought this was the issue. But it doesn't seem like it should be. The port forwarding was going to the 80, 9091, 9092 as before. I can ping the DVR and the internal IP of PC from a phone app. But I don't know how to go beyond that to check the ports and how they are blocked. I tried reset of router and modem after I messed up TV wireless. I hoped this might fix DVR issue but no luck. Is there a tool that can be used to isolate the problem? The cameras are also hard wired to a TV so I can see they are working.
Thanks in advance for considering the problem