SFTP Plugin stopped working

Certified Associate Developer

We have a scheduled process that sends files to a destination via SFTP using the SFTP smart service.
This stopped working when we updated the password in the third-party credentials.
The error message says:
"Error establishing SFTP connection. Confirm your hostname, username and password. See application server log for more details"

The stack trace does not provide more details than the above.

The credentials were verified using an SFTP client (WinSCP).

What could we be missing?

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