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Port forwarding issues. Ports forward briefly (10 -30 seconds) and then are closed

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Port forwarding issues. Ports forward briefly (10 -30 seconds) and then are closed

I have set up simple port forwards via the new Xfi app interface.  I am briefly able to connect and then the gateway closes the port and no future connections are possible. Rebooting has not changed this experience. I have seen other posts on the forums regarding this; often resulting in a direct consultation from comcast.  Please advise how I can proceed.
 
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Expert

Re: Port forwarding issues. Ports forward briefly (10 -30 seconds) and then are closed

Try disabling the Xfi Advanced Security feature as a work-around for now and see. It's buggy ! And there is currently no way for an end-user to whitelist anything;

 

https://www.xfinity.com/support/articles/using-xfinity-xfi-advanced-security



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