> I have been trying to assist someone with a business connection that runs a > server farm. Recently the business cable modem started to short-stop port 53 > for UDP and TCP. Apparently, a transparent DNS proxy somehow got activated > and all outbound traffic to any IPv4 or IPv6 address is intercepted and > handled by the modem – or not handled.
Sounds like the person you helped turned on Security Edge. They can turn it off too at https://business.comcast.com/support/article/internet/securityedge-manage-settings. Jason