Error opening session throug tunnel

I've a connection through a tunnel, that was working with previous release. After upgrading, If I try to use that connection it gives an error (details follow). Opening a session on the first server (the one that has to open the tunnel to the second one) works correctly.

Ask me if you need more info.

WinSCP 5.2.5

Error message:
Invalid access to memory.
Authentication log (see session log for details):
Using username "root".
Access denied.

Authentication failed.

Can you send me an email, so I can send you back a debug version of WinSCP to track the problem? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.

Hi Martin,

I've sent you an email as requested.

Thanks

This bug has been added to the tracker:
https://winscp.net/tracker/1076