Hello
I am facing the same problem.
I have several flows working without issues for almost 2 years and since February 20th none of them are connecting via sFTP/SSH properly to upload generated files (connection is broken, "BadGateway" error).
The connection on our side DID NOT CHANGE and we are still able to connect with the same parameters (host, port, SSH private key...) from Filezilla for example.
Any idea anyone ?