AFAIK starting in 5.5 you need to enable kerberos on the Web UI in any case, as a change in Yarn now requires it for kill/starting actions with Kerberos. The above caching issue might prevent the kill button to work in certain cases until 5.5.3: https://issues.cloudera.org/browse/HUE-3107 So to sum-up, maybe you were lucky if you were testing it on 5.5.1, as all should only work properly in 5.5.3 + checking the spnego for the Web UI (Yarn guys you fix their get delegation toekn API at some point instead) Romain
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