I received the extender I ordered from Amazon. I connected it in the bathroom, which is halfway between the office, where the modem/router is, and the room I want to run Chromecast in. It worked wonderfully. All my devices connect immediately, no more watching the "spinning wheel." Chromecast connects every time and streaming from the iPad is great! Get an extender, it will save aggravation.
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After ripping my hair out trying to attach Chromecast to my network, I wanted to post this to help others. I followed all the support data on the support site stopping short at calling Xfinity (Comcast) because quite honestly, I did not want to sit for hours waiting or getting someone who knew less than me. First, I have an ARRIS TC682 modem/router from Xfinity. I could not get Chromecast to recognize the network so even after resetting the moden several times. I kept getting the uh-oh somethign is wrong message. I checked the router to be sure the plug and play was there and I tried to "discover" the Chromecast. No luck. Second, I decided to add the Chromecast to the router manually be entering the MAC address. I thought this is the first step, then if this didn't work I was goign to assign a permanent IP address. Third, I tried a TV closest to the router and viola! It connected. Then I took it to another TV and it connected with no issues. Then I went to the back of the house to the TV I really wanted it for, and no connection or a limited one. So --- signal strength has a lot to do with Chromecasts ability to communicate with your network. My iPad, cell phone and Samsung tablet all get a signal but it is a weak one and you watch the little indicator swirl around trying to establish a connection. However, once I was able to complete the setup using the TV closeset to the router, I was able to move Chromecast to where I wanted. I went to Amazon and bought an extender. Funny, you know how Amazon has that "here is what others are buying" statement? Well it appears "others" are buying extenders along with Chromecast. I did not assign a permanent IP address -- that was going to be my last attempt and if that didn't work I was going to go get a modem/router I could work with. Thankfully I did not have to do that. I fired up Chromecast and NetFlix -- works like a charm! I had to wait for the weak connection but everything worked. Once the extender comes I am sure the signal in the back will no longer be an issue. Hoping this helps others.
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