Hi,
If it was previously working my guess will be that no instances are started on the SEPAL server.
To check that your parameters are still correctly set, can you try it again but first go to the SEPAL website and start an instance (e.g. t1).
If it works, it means that your credential are perfectly set. You can then try again without opening an instance. Insist several time with FileZilla if you didn't start any SEPAL instance.
If it doesn't work then we need to try something else.
Best,
Pierrick