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.
This is complete, you can use the bastion again.
Cheers, Moritz