Question

How can I detect from the client that jsch session has been disconnected by the server?

Answer 1

You mean other than the isConnected() function on the session object?

Answer 2

If you setup a portforwarding with setPortForwardingL() you can use a function like this to verfiy if the tunnel (and the connection) is still alive. (The example tunnels the Echo Service).

public boolean performCheck() throws Exception {
    Socket socket;

    try {
        socket = new Socket("localhost", 7);

        if (socket.isConnected()) {
            socket.close();
            return true;
        }
    } catch (UnknownHostException e) {
        // nothing special
    } catch (IOException e) {
        // nothing special
    }

    return false;
}

Answer 3

Session.isConnected()

works for me but must be sure you call

Session.setServerAliveInterval(int)

before

Session.connect()

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