我正在尝试将SQL Developer与SSH隧道配合使用。我配置了ssh隧道和sql开发人员连接，但是当我测试ssh隧道时，收到以下错误：
java.lang.IllegalStateException: TcpipForwarder is closed
at org.apache.sshd.common.forward.DefaultForwardingFilter.startLocalPortForwarding(DefaultForwardingFilter.java:196)
at org.apache.sshd.client.session.AbstractClientSession.startLocalPortForwarding(AbstractClientSession.java:333)
at oracle.dbtools.raptor.ssh.core.Tunnel.connect(Tunnel.java:91)
at oracle.dbtools.raptor.ssh.core.HostConnection.openTunnel(HostConnection.java:89)
at oracle.dbtools.raptor.ssh.core.Client.openTunnel(Client.java:333)
at oracle.dbtools.raptor.ssh.navigator.SshController$4.doWork(SshController.java:252)
at oracle.dbtools.raptor.ssh.navigator.SshController$4.doWork(SshController.java:248)
at oracle.dbtools.raptor.backgroundTask.RaptorTask.call(RaptorTask.java:199)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at oracle.dbtools.raptor.backgroundTask.RaptorTaskManager$RaptorFutureTask.run(RaptorTaskManager.java:702)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
在ssh隧道中使用腻子不起作用。 ：（
我该如何解决？
谢谢， 斯蒂芬