New Post: new SshClient Exception on Synology

It's not strange.
Connect() returns after it is done.

Your code was:

using (SshClient client = new SshClient(connectionInfo))
 {
   client.Connect();  //Error starts here
 }   

The client object is created, it gets connected and then everything is done and the using-block disposes the object.

Please be more specific with your problems, else it is impossible to help!
I don't think the forwarding does not work with AnyCpu. What "troubles" did you have?