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Comcast port blocking


paulw

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Posted (edited)

Comcast has started blocking just about all ports in our area.  The only ones I have found open are 21 and 443 of the more common ones. I was using a high number in replace of 80 for http but it is now blocked.  Anyone using Comcast and found a work around?  Yes, I am sure it is Comcast, have turned off firewall while testing.

 

Had been using 587 for smtp, that is now closed also.

Edited by paulw
Posted

My ip4 subnet has changed, staring with the first octet, a few times recently. But no port blocking.

Is it possible you have router-behind-router and the Comcast router/cable modem is doing it?

 

Paul

Posted

Have made no changes to router in a long time, did reboot it but no change, running bridge mode.  I am finding that of the 20 or so more common ports only 2, 21 and 443 are open. Even remote access 3389 is now closed.

Posted (edited)

Do you think that Comcast has blocked all the more than 49,000 possible ports? What is you have IP cameras or other devices that need a port? BTW. port 443 requires HTTPS

Edited by stusviews
Posted

Comcast is forthcoming about what inbound ports they block, see https://www.xfinity.com/support/internet/list-of-blocked-ports/

 

If you want to set up an port forwarding for inbound connections, choose a random high port.  You can run HTTPS on any port you want.

 

What about iot that uses its own non standard ports like the isy portal?
paul

ISY Portal does not require any inbound ports open nor port forwarding; when using the portal your ISY994 connects outbound to the cloud server.

Posted

 

 

ISY Portal does not require any inbound ports open nor port forwarding; when using the portal your ISY994 connects outbound to the cloud server.

 

Right... when things like mail ports were mentioned, I was thinking he meant outbound ports were getting blocked.

 

 

Sent from my iPhone using Tapatalk

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