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Anon837417
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Not applicable

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4 Messages

Thursday, March 14th, 2024 5:55 PM

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Opening UDP Ports

I have a T-Mobile cellular signal booster that apparently requires UDP Ports 123, 500 and 4500 to be open in order that the device can connect to the internet. As someone who is not particularly knowledgeable in the field of networking, the suggestions available online are confusing and assume advanced knowledge that I do not possess. Plus, there is some information suggesting that Xfinity has blocked such changes for home users.

Getting in touch with an actual human employee of Xfinity would be my first choice, but they don't make it easy. 

Any suggestions will be welcome.

Question

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Updated 

1 year ago

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BruceW

Gold Problem Solver

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26.3K Messages

1 year ago

... requires UDP Ports 123, 500 and 4500 to be open ...

Comcast doesn't block those. See https://www.xfinity.com/support/articles/list-of-blocked-ports.

Please be aware that there are 2 kinds of responses in this Forum: Replies and Comments. When you Comment on a post by scrolling down to "Comment on this post here...", I am notified of your response. But if you select Reply, I am NOT notified and may not be aware of your response.

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Anon837417

Not applicable

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4 Messages

Thanks very much for responding and sharing the Xfinity blocked ports list.

When I open up a command window and run Netstat -a, I see the following display for the relevant ports. Other ports in the list (not shown) have lots more detail on each line. How can I interpret this display?

 

1 year ago

0

XfinityThomasC

Official Employee

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2.5K Messages

@Anon837417

Netstat -a Displays all active connections and the TCP and UDP ports on which the computer is listening. Check out this wiki https://en.wikipedia.org/wiki/Netstat that covers the command-line parameters. 

 

 

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I am an Official Xfinity Employee.
Official Employees are from multiple teams within Xfinity: CARE, Product, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Please, mark a reply as the Accepted Answer.tick

1 year ago

0

XfinityThomasC

Official Employee

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2.5K Messages

1 year ago

Hello @Anon837417 this is a little outside our scope but this article https://www.xfinity.com/support/articles/list-of-blocked-ports will cover the list of ports that are blocked by Xfinity. 

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