Humm that's weird. Try:
FWIW: I'm having the same problem, I have three devices that will connect to xfinitywifi hotspots in my home. Now they connect to the hotspot, but there is no internet. I've forgotten the connection, connected to the home private network It's fine.
The xfinitywifi signal is strong, but no internet. I even tried deleting a device from my devices that connect to xfinitywifi in my account, didn't help. I would have expected a browser to come up requesting the userID and password when trying to reconnect that device but it didn't happen.
EDIT: whatever the problem was with the hotspots, it's now fixed for me at least, after a couple days of being down.
I can't tell whether the xfinitwifi SSID shows up in the list of available networks. If it doesn't you can turn it on with My Account.
Question. To clarify, are you trying to connect to your own home network's *private* WiFi broadcast signal or the xfinitywifi *public* hotspot that is also broadcast by the gateway device ?
The default private one looks like this: HOME-XXXX-2.4 or HOME-XXXX-5
XXXX = various letters and numerals.
The public WiFi hotspot looks like this: xfinitywifi
I'm using the same modem i had prior to it being swapped out by tech. ARRIS TG862 (TG862GCT) 343 Mbps Cable modem. The issue: I see "xfinitywifi" on my Wi-Fi list, i click and it says connecting. Then I get the error "unable to obtain IP address ". I have full Wi-Fi strength signals. I was successfully able to connect before the tech changed my modem (due to unrelated issues). All devices that were able to connect before (cell, tablet, iPhone) now have the same issue. The 2nd tech who came to address the issue was successfully able to connect . My new laptop is able to connect w/o the IP error. I have forgotten the networks, rebooted device and modem and still doesn't work.
Are you using separate names for your SSID's (2.4 and 5)?
It's a difficult one. I once exchanged a rental gateway with Comcast. I had the hotspot enabled in my account settings, but the hotspot failed to show for just over a week after receiving the device.
I used to use the free inSSIDer app to look at the wireless around me. I could tell if the gateways hotspot was broadcasting, because the channel would be the same as my own private network, same power and the MAC address would be 1 or 2 digits different, from the private SSID.
Could be that you are trying to connect to a hotspot that is just out of range for you.
(but then if your new laptop does connect, it doesn't explain why your other devices don't)...! My hotspot connection probs, disappeared on their own after a few days, as I mentioned in the earlier post