I tech support these machines every day I shoulde able to help hopefully.....
Firstly can you connect locally on the wifi?
if you have no wifi make sure you have set the gateway correctly, I get this time and time again where people forget the gateway.
Your RTSP port in ipolis should be 558
I change the http port in the dvr to 81 and use that for the web viewer port - this must be open on the router as well
Keep in mind only one admin user can be connected at any one time.