Verizon 4G LTE Extender Hangs on Connection to Verizon SeGW Server on Xfinity Xfi Home Network

I’m having problems getting a Verizon 4G LTE Extender to work on my Xfinity Xfi Home Network.  The 4G LTE Extender box keeps “hanging” on connecting to the Verizon SeGW Server on Port 4500.  It connects, but then disconnects and status is “Authorization Failure”.  It does this every 15 seconds.

The Extender box, upon startup, goes thru Hardware & Software Initializations, and then connects to my Xfinity Xfi Router/Modem.  It then establishes coverage from a multitude/adequate number of GPS Satellites, but then gets “hung” connecting to the Verizon SeGW Server on Port 4500.

I’ve been on the Verizon and Xfinity support lines a “gazillion” times.  They each point the “finger” at each other!  Verizon says that Xfinity needs to “unlock” certain Ports for this to work.  Xfinity says that the required Ports are not blocked.  Verizon also says that the 4G LTE Extender is “registered”, so it should have no problem getting into the SeGW Server.

Verizon provided me the following Ports/Settings that are needed to make the Extender work:

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Ports:

• UDP 319
• UDP 320
• UDP 500
• UDP 4500
• UDP 52428 + 20906
• TCP/UDP 443 + 80

Other Settings:

• Make sure ESP packets are not blocked by the firewall on the downstream
• Enable high QoS for the Femto (LTE Extender)
• Make sure MTU Size is set to 1448 or higher
• Enable DMZ: recommended. NOT required.  Common on most consumer routers.

I talked to Xfinity and they say that all the above should be OK, without any problem.

I tried playing around with the Xfi Router Firewall – doesn’t make a difference.  Also, I tried Port Forwarding and Port Triggering for the above Ports and putting the Verizon 4G LTE Extender in the Router DMZ, and none of those solve the problem.

I gotta believe that across the USA that there are many people that have the Verizon 4G LTE Extender working with an Xfinity Xfi Home Network !!

Am I missing something?  I also can’t believe that Verizon and/or Xfinity can’t resolve this issue.

Any help from anyone would be much appreciated… Thanks much…