DNS Flag Day: I had to open the TCP/53 port

Ben Croswell ben.croswell at gmail.com
Mon Feb 4 13:50:13 UTC 2019

BIND has always required UDP and TCP 53 for proper functionality. It
sometimes mistakenly believed that TCP is only for zone transfers but that
is not the case.

On Mon, Feb 4, 2019, 8:46 AM Roberto Carna <robertocarna36 at gmail.com wrote:

> Dear, I have a BIND 9.10 public server and I have delegated some public
> domains.
> When I test these domains with the EDNS tool offered in the DNS Flag Day
> webpage, the test was wrong wit just UDP/53 port opened to Internet.
> After that, when I opened also TCP/53 port, the test was succesful.
> Please can you explain me the reason I have to open TCP/53 port to
> Internet from February 1st to the future???
> Really thanks, regards.
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