[HECnet] All gone silent

[Mark]

Crazy as it sounds that could be the reason. Have you a static IP and have you had it a long time?

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On Tue, Aug 17, 2021 at 19:19, Thomas DeBellis <tommytimesharing at gmail.com> wrote:

> The only thing that comes to mind immediately would be some kind of
> misguided attempt to mitigate possible DOS attacks via white listing.
>
> On 8/16/21 9:04 PM, Paul Koning wrote:
>>
>>> On Aug 16, 2021, at 6:36 PM, Mark <mwjr at protonmail.com> wrote:
>>>
>>> Mystery solved (or at least the mystery of no response) - I used to have some issues when I ran authoratitive DNS and mail directly from our school's IP addresses rather than an 'established' (big tech co) source
>> Why would that explain the failure to answer DNS queries? DNS servers are supposed to answer queries from everyone. I've never heard of failing to do so. FWIW, I just tried asking ns1.protonmail.ch about mail.protonmail.ch, and it was happy to answer me (to my random Comcast client addresses, IPv4 and IPv6 both work).
>>
>> paul
>>
>>
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