Aiport Extreme yellow light keeps blinking won't connect

The Airport Extreme is connected to a Xfinity modem and the modem's router is disabled

OK, we got that the modem/router is not performing routing functions.

I had the Xfinity model enable the router and I have a connection with it

Now, you are indicating that the modem router is performing routing functions.

Can you clarify at the present time, whether the modem/router is or is not performing routing functions?

We ask, because the setup of the AirPort Extreme will vary according to whether you have a simple modem (with no routing being performed by the device), or a device that is providing routing functions for the network.

But even with pushing the reset button, it will not connect and the light turn green.

Here, we assume that you are talking about the AirPort Extreme. Resetting the AirPort erases the current network settings, so the AirPort Extreme will blink amber (forever) until it is set up once again to work with your modem. If the settings are correct, the indicator light on the AirPort will turn green.

Are you saying here that you did not set up the AirPort again after you reset it, or are you saying that you reset it, did set it up again, and are still having difficulty?

OK, thanks for the clarification on that.

You did mark your question as solved. Does that mean that AirPort Extreme is now functioning correctly with a green light, or is the AirPort still not behaving?

No one except the original poster can mark a thread as "solved", so whether or not you were aware, you did mark it as "solved".

I assume that the router function of the Xfinity modem/router is still enabled, as you indicate above.

With the AirPort Extreme powered on, hold in the reset button on the back of the device for 7-8 seconds and release. Allow a full minute for the AirPort Extreme to restart to a slow, blinking amber light status.

Verify that an Ethernet cable connects from one of the four LAN <--> ports on the Xfinity modem/router to the WAN "O" port on the AirPort Extreme

Click the WiFi icon at the top of your Mac's screen and look for a listing of New AirPort Base Station. Just below that, click on AirPort Extreme

That will get the setup "wizard" running. It will take a minute to analyze the settings and then suggest a setup for the AirPort Extreme, which will look similar to the example below, except that you will see a picture of the AirPort Extreme.

Network Name..........Type in a simple name for the wireless network

Base Station Name..........Type in a simple name that you want to call the AirPort Extreme

Password..........Type in a password to be used for the wireless network name and AirPort Extreme

Verify.........Type in the same password again to confirm

Click Next

The "wizard" will set up everything for you automatically. When you see the message of Setup Complete, click Done.

The AirPort Extreme should have a green light and you should be able to connect to the wireless network that you named.

I am also experiencing this problem. I've switched the eather cable out on the xfinity Arris. No solution. I do have both ether ports showing a status- the xfinity is yellow -solid and the airport extreme "o" port is green-solid. The same problem presents itself after airport utility tries connect to wizard "An unexpected error occurs".

Solid amber light then after a minute a blinking amber light.

So... I was able to verify that the Lan ports are all functioning both on the Xfinity Arris and the Airport Extreme. Still same issue of no connectivity. Any Leads?

If the LAN ports are all functioning, then there is connectivity.

Not sure what you mean when you say that there is no connectivity.