Hi, tomorrow (July 20th) at 15:00 UTC (08:00 PDT / 11:00 EDT / 17:00 CEST), there'll be a maintenance to the network switch which connects the bast1003.wikimedia.org bastion. This will interrupt network links (and thus your SSH connections over that bastion server) for up to a minute.
If you're accessing a Wikimedia production server over bast1003.wikimedia.org around that time, please switch your SSH client config to use e.g. bast2002.wikimedia.org (which will be unaffected).
The Phabricator task for this network maintenance is https://phabricator.wikimedia.org/T286069
Cheers, Moritz