[11/29/16 10:55:03] [SSH] Checking java version of java
[11/29/16 10:55:04] [SSH] java -version returned 1.8.0_65.
[11/29/16 10:55:04] [SSH] Starting sftp client.
[11/29/16 10:55:04] [SSH] SFTP failed. Copying via SCP.
[11/29/16 10:55:05] [SSH] Copying latest slave.jar...
ERROR: Unexpected error in launching a slave. This is probably a bug in Jenkins.
java.lang.NullPointerException
	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1792)
	at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1769)
	at org.apache.commons.io.IOUtils.copy(IOUtils.java:1744)
	at org.apache.commons.io.IOUtils.toByteArray(IOUtils.java:462)
	at hudson.plugins.sshslaves.SSHLauncher.copySlaveJarUsingSCP(SSHLauncher.java:1098)
	at hudson.plugins.sshslaves.SSHLauncher.copySlaveJar(SSHLauncher.java:1059)
	at hudson.plugins.sshslaves.SSHLauncher.access$300(SSHLauncher.java:137)
	at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:723)
	at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:706)
	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
[11/29/16 10:55:05] Launch failed - cleaning up connection
[11/29/16 10:55:05] [SSH] Connection closed.

[jenkins@master ~]$ ssh -l jenkins slave -v
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to slave [xxxx] port 22.
debug1: Connection established.
debug1: identity file /home/jenkins/.ssh/id_rsa type 1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'slave' is known and matches the DSA host key.
debug1: Found key in /home/jenkins/.ssh/known_hosts:13
debug1: ssh_dss_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
xxxx
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: publickey
debug1: Offering public key: /home/jenkins/.ssh/id_rsa
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: password
jenkins@slave's password:
debug1: Authentication succeeded (password).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: Sending environment.
debug1: Sending env LANG = en_US.UTF-8
Last login: Tue Nov 29 11:05:09 2016 from master