WinSCP .NET assembly: Where to define proxy?

Question

I am able to define the proxy server by using the WinSCP GUI. If I do this I am able to connect to a remote host. But in code I don't find a way to declare the proxy server for WinSCP.

In this case I receive

Remote server returned an error (407) Proxy authentication required.

My code:

SessionOptions sessionOptions = new SessionOptions
   {
       Protocol = protocol,
       HostName = hostname,
       UserName = user,
       Password = pass,
       PortNumber = portnumber
   };

using (Session session = new Session())
{
    session.ExecutablePath = @"C:\Program Files (x86)\WinSCP\WinSCP.exe";
    session.Open(sessionOptions);

    TransferOptions options = new TransferOptions();
    options.FileMask = mask;


    SynchronizationResult synchronizationResult;
    synchronizationResult =
        session.SynchronizeDirectories(mode, local, path, deletefiles, options: options);

    synchronizationResult.Check();
}

Answer 1

Use the SessionOptions.AddRawSettings to configure raw session settings appropriate for your kind of proxy.

For example:

sessionOptions.AddRawSettings("ProxyMethod", "3");
sessionOptions.AddRawSettings("ProxyHost", "proxy");

See a full list of raw sessions settings.

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Though a way easier is to configure the proxy in WinSCP GUI and have it generate a code template for you.