WinSCP.SessionRemoteException: Host does not exist error

It's working fine via WinSCP tool. When I try to run it from C# Windows application, I get below error.

WinSCP.SessionRemoteException: Host 'xxx.xxx.xxx' does not exist.

Are you able to connect to that host anyhow from the same machine? In WinSCP GUI? In any other client using the same protocol?

Yes it's connecting fine when I do it via Windows SCP tool. The problem occurs only when I execute the connection from my C# windows application. One more point to add here. Authentication happens via ppk file. Not sure it's because of this ppk file(encrypted password file).

As the request is bit urgent, any fast response would be highly appreciated. Thanks.

Please post session log files both from GUI and the code – both from the same local machine and same local account.