Did you check .InnerException?
https://learn.microsoft.com/en-us/dotnet/api/system.exception.innerexception

If that does not help, enable logging using Session.SessionLogPath and inspect the log file.

Hi is there any way\ to get more info on this failure? one idea is to do FTP -v
for verbose?
can we do that?
-------Program Starts Running---------- - 1/14/2016 12:22:14 PM
Error:WinSCP.SessionRemoteException: Authentication failed.
at WinSCP.SessionLogReader.Read(LogReadFlags flags)
at WinSCP.ElementLogReader.Read(LogReadFlags flags)
at WinSCP.SessionElementLogReader.Read(LogReadFlags flags)
at WinSCP.CustomLogReader.TryWaitForNonEmptyElement(String localName, LogReadFlags flags)
at WinSCP.CustomLogReader.WaitForNonEmptyElement(String localName, LogReadFlags flags)
at WinSCP.CustomLogReader.WaitForNonEmptyElementAndCreateLogReader(String localName, LogReadFlags flags)
at WinSCP.CustomLogReader.WaitForGroupAndCreateLogReader()
at WinSCP.Session.Open(SessionOptions sessionOptions)
at SFTPGetConsole.ReportFtpVersion.RunGetReports() in \\fs1\userdata\philk\My Documents\FTPGetConsole\SFTPGetConsoleVersion2\SFTPGetConsole2\ReportFtpVersion.cs:line 30 - 1/14/2016 12:23:01 PM
-------Program End---------- - 1/14/2016 12:23:01 PM
-------Program Ends ---------- - 1/14/2016 12:23:01 PM