The slave https://integration.wikimedia.org/ci/computer/integration-slave-precise-1011/ went offline, it apparently rejects the SSH key:
```
[08/24/15 14:34:34] [SSH] Opening SSH connection to 10.68.17.70:22.
ERROR: Server rejected the 1 private key(s) for jenkins-deploy (credentialId:ae711ff4-813e-4462-9a27-21bdbd4fdcb9/method:publickey)
[08/24/15 14:34:34] [SSH] Authentication failed.
hudson.AbortException: Authentication failed.
at hudson.plugins.sshslaves.SSHLauncher.openConnection(SSHLauncher.java:1178)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:701)
at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:696)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
[08/24/15 14:34:34] Launch failed - cleaning up connection
[08/24/15 14:34:34] [SSH] Connection closed.
```