sample code to connect to SFTP just like WinSCP? (wodSFTP / wodSFTP.NET / wodSFTPdll)

I see.

Well, I can't say without trying. If WinSCP works then wodSFTP should too - not much client can do if server rejects him.
Only thing I notice is that you use Pubkey authentication, and you have specified password also - no need to specify it.. Or you wanted to use both for authentication?

If all fails, can you send all the details to our techsupport so we can try to connect there and debug the issue? This is simple issue and has to work.

Regards,
Jasmine