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Re: Persistent failure to lookup hostname

From: Stefan Monnier
Subject: Re: Persistent failure to lookup hostname
Date: Tue, 04 Oct 2022 09:27:03 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux)

Robert Pluim [2022-10-04 09:37:53] wrote:
>>>>>> On Mon, 03 Oct 2022 20:15:19 -0400, Stefan Monnier 
>>>>>> <monnier@iro.umontreal.ca> said:
>     Stefan> Lars Ingebrigtsen [2022-10-04 01:58:28] wrote:
>     >> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>     >>> My Gnus session occasionally gets into a state where it insists that 
> my
>     >>> mail server's DNS name isn't found.
>     >> Is this with nnimap?  (I'm mostly just wondering whether this could
>     >> somehow be tied to the async code paths, which are more complicated 
> than
>     >> the synchronous code paths and keep more state -- but nnimap doesn't 
> use
>     >> async, so that would rule out that.)
>     Stefan> Hmm... yes, I think it's always been for my IMAP server.
> One thing you absolutely need to check in these situations is if DNS queries
> are making it out of Emacs at all. e.g.
>     sudo tcpdump -i any -n udp and port 53
> If theyʼre not, then maybe itʼs an issue with resolv.conf, as Madhu
> suggests.

Indeed, they may also be sent to "the wrong" nameserver (e.g. the
nameserver that was to be used back when I was working in that café the
other day).



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