Created Issue: Use SshClient to connect to Avaya Media Gateway [1458]

I am trying to create a small app to work on Avaya Media Gateways using Renci.SshNet. I am stuck with opening an ssh connection to the gateway. When I issue an sshClient.Open(), the program gives NullReferenceException

The ssClient object says that 3des-cbc and hmac-md5 are used. The GW uses ssh2

I am able to connect with this app to my own linux box.

Any suggestions?