unable to connect SFTP using Tamir.SharpSSH dll

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C#3.5

Unable to connect to SFTP using Tamir.SharpSSH dll but manually i can connect it using FileZilla Client.

Session.connect: System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
--- End of inner exception stack trace ---
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
at System.IO.Stream.ReadByte()
at Tamir.SharpSsh.java.io.JStream.ReadByte()
at Tamir.SharpSsh.jsch.IO.getByte()
at Tamir.SharpSsh.jsch.Session.connect(Int32 connectTimeout)