Edited Issue: SftpClient is throwing undocumented exceptions [2148]

The documentation says that Connect can throw InvalidOperationException and ObjectDisposedException, but when you can't connect (remote server stopped, network problem, ...) a SocketException is thrown after a long timeout (about 10 seconds).

Worst, if you catch the exception and log the error another SocketException is thrown when you call Dispose. Documentation doesn't list any exceptions for Dispose.