How can I access my home security DVR from the internet?

Question

My Time Capsule (as a router and not a bridge) blocks me from accessing my home security DVR from the internet.  I can access it from other computers connected to my LAN but not from the internet.  I guess it's a firewall setting issue.  I can't add the home security application to the list of firewall allowed incoming connections since it's a Windows app that I cannot install on my Mac.  On the other hand, the app is installed on my old PC but I can't access the Mac firwall settings from the PC and add the security app (If that's the problem).
My DVR is connected to a Netgear switch which is connected to the Time Capsule which is connected to a Cisco modem provided by Comcast. I thought one of the modem ports had to be opened by Comcast. That was not the issue.  After spending 2 hours on the phone with Comcast going in circles talking to 10 different overseas agents, they concluded the Netgear switch was blocking me from accessing the DVR.  I think they are wrong and that it's a Mac firewall problem.  HELP!!!  Does anyone know what could be the problem and how to solve it?

Answer 1

Did you forward the required ports in the TIme Capsule? If not it won't work.. it has nothing to do with firewall unless the DVR is plugged into the Mac. If it is plugged into a switch you need to lock the IP of the DVR and find out what ports are required.. usually just port 80, ie html.. but it could be some others.
Since Apple do not use upnp to open ports.. the TC will have to manually be provided with the ports.. Apple use PMP-NAT that is not used by the rest of the known world.. Just to ensure you stay in the camp.