Why is the TV not connecting to wifi?

It could be two things.

First, pull the plug on the router, wait 5 minutes and plug it back in. Wait 15 minutes and connect the television again.

It may also be that signing in to WIFI is one operation and signing your television into your television account is a second step.

Call Xfinity Support if you still have issues.

Comcast Customer Service - Xfinity Technical Support

Xfinity https://www.xfinity.com > support
Comcast Customer Service is here to provide Help and Support for your Xfinity Internet, TV, Voice, Home and other services.

‎Internet · ‎California Residents · ‎Xfinity Mobile · ‎Xfinity Assistant

press it hard and try to vibrate the button sometimes it makes bad contact or random connection. Also try different remote or ask you cable provide for replacement.

Xfinity Streampix is an "on-demand online media streaming service" provided by Comcast. Now here's some great news, you can enjoy the content selection courtesy of Xfinity stream on your Roku streaming player as the Xfinity TV beta app is now available on Roku. xfinity.com/authorize You can install or add the Xfinity TV beta app from the Roku Channel.

What do you mean by "fully connect"? How far are you from the router? Xfinity has a weaker WiFi signal than most companies. I had them and could not get a good signal when I went to my bedroom from my office (a distance of about 50' with four walls between them).
You could ask them for a stronger router, though I doubt they have one or else they will charge you more on your monthly bill for it. You can also check online for WiFi boosters. They seem to have problems too. Look to YouTube or Instructibles for building your own, inexpensive, booster (usually free if you don't mind it LOOKING homemade).
Hope this helped.

Amazon.com Help: Basic Troubleshooting for Amazon Fire TV

https://www.amazon.com/gp/help/.../display.html?...

Amazon.com, Inc.... five seconds. Or, open Settings > System > Restart from the main menu. ... Note: External storage options are not available for Fire TV Stick. First, make sure ...

Amazon.com: Customer Discussions: Connecting Fire Stick to Wifi

www.amazon.com/forum/kindle?_encoding...

Amazon.com, Inc.Dec 21, 2014 - No questions asked. .... I have the same problem because my network is considered open ... I'm trying to connect to a friends Xfinity wifi with fire tv stick, I have my laptop, Ipad & phone all working thru it but TV Stick won't. ... Mine wouldn'taccept password until I connect the HDMI extender - works fine now. Fire TV Stick keeps asking for ...
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xfinity IS COMCAST,you are better off controlling the dvd,tv and xfinity with the xfinity remote, http://customer.xfinity.com/remotes/?ts=2

What are you using for your main router (xfinity wifi)? The best way is to set the ecb350 in AP Router Mode not a repeater since you have a rj45 cable long enough to go from one of the ports on the xfinity wifi router and hook it into the ecb350. You will need to know what your ip address range is for example if the xfinity is 192.168.1.1 then you want to assign a static address for the ecb350 to be 192.168.1.100 (assigned IP Address) You will also need the Subnet mask, Default Gateway IP Address, and Primary DNS and Secondary DNS of the xfinity wifi router. Then on the ecb350 you will need to configure the following with the info you go off the xfinity router:


Static IP Internet Connection Type Select Static IP to begin configuration of the Static IP connection. Account Name Leave Blank Domain Name Leave Blank MTU Auto IP Address ie: 192.168.1.100 (assigned IP Address) IP Subnet Mask Specify the subnet mask of your Xfinity Router Gateway IP Address Specify the gateway of your Xfinity Router Primary DNS Specify the primary DNS server's IP address of your Xfinity Router Secondary DNS Specify the secondary DNS server's IP address of your Xfinity Router Discard Ping on WAN Check to Enable to recognize pings on the ECB350 WAN interface or Disable to block pings on the ECB350 WAN interface. Note: Pinging IP addresses is a common method used by hackers to test whether the IP address is valid. Blocking pings provides some extra security from hackers. Accept / Cancel Click Accept to confirm the changes or Cancel to cancel and return previous settings. Note: Clicking Accept does not apply the changes. To apply them, use Status > Save/Load Hope that this help you.

The Xfinity Arris 805 and 862 and CP3939 wifi info is on the bottom of the router on the white sticker. If the sticker is missing call Comcast 1-800-226-2278

Step 1:

The wifi password is on your wifi router, hopefully someone wrote it down and taped it to your router, if not you need to loginto your router to find out what it is.
Once you have the password:

Step 2:

On your ipod touch

Verify Wi-Fi is enabled and that you are connected to a Wi-Fi network.

Tap Settings > Wi-Fi. If Wi-Fi is off, turn it on by tapping the on/off icon.

Available Wi-Fi networks appears under "Choose a Network..."

Locate and tap the Wi-Fi network you want to join then enter your password

The Xfinity Cable Service is also an Internet service provider then you need a cable modem with a built-in wireless router.
Check with Xfinity and if they are also an Internet Service provider then they can also supply this cable modem/wireless router.