Router issues

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http://forums.androidcentral.com – Let me start off by saying that I don't think this is an issue with Chromecast. Either 1) I'm a bonehead, or 2) my router has issues. When I try to setup the Chromecast, it errors out. It tells me one of two things: 1) My UPNP is disabled and I need to enable it (I've verified in my router settings that UPNP is enabled). 2) I'm using a dual band router and AP Isolation (aka Client Isolation) may be enabled and needs to be disabled. I've looked through my router settings, manual, etc. about 5 times tonight and can't find anything in regard to AP/Client Isolation. Does anyone have any sug (HowTos)