https://community.cloudera.com/t5/Support-Questions/nifi-publishkafka-TimeoutException-Failed-to-update-metadata/m-p/183345#M145509 <P><A rel="user" href="https://community.cloudera.com/users/16412/simonjespersen.html" nodeid="16412">@Simon Jespersen</A> </P><P>Run this command on your keytab file:</P><P>klist -kt /etc/security/keytabs/kafka.service.keytab</P><P>Whatever is displayed should be your principal in the jaas-client.config file.</P> Sat, 16 Sep 2017 02:52:29 GMT Wynner 2017-09-16T02:52:29Z