a few months ago the cable company replaced my router (netgear) with their optimum router since I was having connection drop problems. Then I could stream live TV fine except now I cannot record or playback from DVR. Sling guy told me it is nothing they could be blocking and must be cable company/router/dvr issue. To me, it must be router since that is all that changed. Is there a port that should be opened to allow recording and playback that would be different than the steaming one? I thought if I can watch TV then I don't get why recording would need a different port.
I am in china so any advice would be great.