Yes of course they do. If you need NetBIOS and SMB, create a VPN tunnel.

List of ports
https://customer.xfinity.com/help-and-support/internet/list-of-blocked-ports/

On Sep 11, 2016 2:45 PM, Ca By <[email protected]> wrote:
On Sunday, September 11, 2016, Randy Bush <[email protected]> wrote:

> anyone know if comcast residential filters 139/445?
>
> randy
>


https://customer.xfinity.com/help-and-support/internet/list-of-blocked-ports/


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