Nsryjdtyk

I have been posting questions on jenkins installation and plugins, as i'm new to Jenkins.
I have been trying to connect the slave SSH to the Jenkins.
But couldn't establish connection between the host. its failing with the following error. I'm able to ssh the slave from master and master from slave. but not through GUI.
I'm using the latest version of JENKINS upgraded ssh-plugin
just to be sure.

the Jenkins server is running is Linux Ubuntu 14.04, with the NAT network. port forwarded for GUI from 8080->xxxx and ssh 22-> xxxx on the VM

SSHLauncher{host='xxx.xxx.x.xxx', port=xxxx, credentialsId='b67c41e6-5def- 

4873-bb43-3802a8a865ec', jvmOptions='', javaPath='', prefixStartSlaveCmd='', 

suffixStartSlaveCmd='', launchTimeoutSeconds=210, maxNumRetries=10, 

retryWaitTime=15, 





sshHostKeyVerificationStrategy=hudson.plugins.sshslaves.verifiers.KnownHostsFileKeyVerificationStrategy, tcpNoDelay=true, trackCredentials=true}

[11/20/18 16:21:45] [SSH] Opening SSH connection to xxx.xxx.xxx.xxx:xxxx.

[11/20/18 16:21:45] [SSH] The SSH key presented by the remote host does not match the key saved in the Known Hosts file against this host. Connections to this host will be denied until the two keys match.

Key exchange was not finished, connection is closed.

java.io.IOException: There was a problem while connecting to ip_Address:port

    at com.trilead.ssh2.Connection.connect(Connection.java:834)

    at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:1175)

    at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:846)

    at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:833)

    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: 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)

    ... 7 more

Caused by: java.io.IOException: The server hostkey was not accepted by the verifier callback

    at com.trilead.ssh2.transport.KexManager.handleMessage(KexManager.java:548)

    at com.trilead.ssh2.transport.TransportManager.receiveLoop(TransportManager.java:790)

    at com.trilead.ssh2.transport.TransportManager$1.run(TransportManager.java:502)

    ... 1 more

[11/20/18 16:21:45] Launch failed - cleaning up connection

[11/20/18 16:21:45] [SSH] Connection closed.

Appreciate any help in this. Found similar questions online, but the solutions suggested are not able to fix my problem.