bug#40748: 28.0.50; Switching wifi networks hangs dns lookups

[Dmitry Alexandrov]

> I often have trouble reconnecting Gnus' nntp servers after sleeping the 
> laptop in one location, and waking it up in another, connecting to a new wifi 
> network

> I edebugged `nntp-open-connection', and realized that the error ‹…› is 
> actually a dns error:

Looks familiar!

> Here's the code that opens the connection; in my case it's 
> nntp-open-network-stream/network.

Could not it actually be an even deeper issue I outlined in bug#41234: 27.0.91; 
Synchronous network requests are failing with “Name or service not known” [1]?

[1] <mid:1rnogg6b.dag@gnui.org>
    <https://bugs.gnu.org/41234>

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