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The Client.NewSession method only returns the Session, but the opened channel is useless, and the user cannot obtain the channel because it is a private property. If you want to use the channel, you need to call the openChanne() method again. When I log in to the server and the switch ssh remotely, I use this source code, the server can be used normally, but the switch can only have one Session and one Channel, and cannot open another channel again. I add the NewSessionAndChannel() method to return the channel and request in the Session together, and use the channel to communicate with the switch and the server normally.