can't access server using WinSCP

This post on our Community Site addresses this error with WinSCP and may offer a solution:

• winscp

While it doesn't provide a lot of information about how to fix any of these issues, this WinSCP forum explains the reasons this might happen:

• Access denied

That might be a good starting point to look into issues if the previous resource doesn't resolve the issue.

Finally, this StackOverflow discussion talks specifically about the pre-entered password and explains how to get additional logging, which I think could be helpful:

• WinSCP.com Access is denied with a pre-entered password but working manually