java.io.IOException: Could not open channel (state:4)
 at com.trilead.ssh2.channel.ChannelManager.ioException(ChannelManager.java:1542)
 at com.trilead.ssh2.channel.ChannelManager.waitUntilChannelOpen(ChannelManager.java:124)
 at com.trilead.ssh2.channel.ChannelManager.openSessionChannel(ChannelManager.java:576)
 at com.trilead.ssh2.Session.<init>(Session.java:42)
 at com.trilead.ssh2.Connection.openSession(Connection.java:1082)
 at com.trilead.ssh2.Connection.exec(Connection.java:1473)
 at hudson.plugins.sshslaves.SSHLauncher.verifyNoHeaderJunk(SSHLauncher.java:583)
 at hudson.plugins.sshslaves.SSHLauncher.access$100(SSHLauncher.java:113)
 at hudson.plugins.sshslaves.SSHLauncher$1.call(SSHLauncher.java:438)
 at hudson.plugins.sshslaves.SSHLauncher$1.call(SSHLauncher.java:423)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: The connection is being shutdown
 at com.trilead.ssh2.channel.ChannelManager.handleEndMessage(ChannelManager.java:1524)
 at com.trilead.ssh2.transport.TransportManager$1.run(TransportManager.java:535) ... 1 more
Caused by: java.net.SocketException: Connection reset
 at java.net.SocketInputStream.read(SocketInputStream.java:210)
 at java.net.SocketInputStream.read(SocketInputStream.java:141)
 at com.trilead.ssh2.crypto.cipher.CipherInputStream.fill_buffer(CipherInputStream.java:41)
 at com.trilead.ssh2.crypto.cipher.CipherInputStream.internal_read(CipherInputStream.java:52)
 at com.trilead.ssh2.crypto.cipher.CipherInputStream.getBlock(CipherInputStream.java:79)
 at com.trilead.ssh2.crypto.cipher.CipherInputStream.read(CipherInputStream.java:108)
 at com.trilead.ssh2.transport.TransportConnection.receiveMessage(TransportConnection.java:232)
 at com.trilead.ssh2.transport.TransportManager.receiveLoop(TransportManager.java:706)
 at com.trilead.ssh2.transport.TransportManager$1.run(TransportManager.java:502) ... 1 more [01/25/21 13:15:09] Launch failed - cleaning up connection [01/25/21 13:15:09] [SSH] Connection closed.