[05/02/17 09:28:18] [SSH] Opening SSH connection to quark:22.
Key exchange was not finished, connection is closed.
java.io.IOException: There was a problem while connecting to quark:22
        at com.trilead.ssh2.Connection.connect(Connection.java:834)
        at com.trilead.ssh2.Connection.connect(Connection.java:703)
        at com.trilead.ssh2.Connection.connect(Connection.java:617)
        at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:1265)
        at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:790)
        at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:785)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Key exchange was not finished, connection is closed.
        at com.trilead.ssh2.transport.KexManager.getOrWaitForConnectionInfo(KexManager.java:95)
        at com.trilead.ssh2.transport.TransportManager.getConnectionInfo(TransportManager.java:237)
        at com.trilead.ssh2.Connection.connect(Connection.java:786)
        ... 9 more
Caused by: java.io.IOException: Cannot read full block, EOF reached.
        at com.trilead.ssh2.crypto.cipher.CipherInputStream.getBlock(CipherInputStream.java:81)
        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
[05/02/17 09:28:18] Launch failed - cleaning up connection
[05/02/17 09:28:18] [SSH] Connection closed.