Sometimes, after disabling Kerberos successfully, you can get below error while accessing NN or RM UIs.
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Because of this, all the alerts, Ambari metrics data can be broken because JMX data won't be available to Ambari Metrics or Alerts via HTTP..
Resolution:
Modify below propery in core-site.xml via Ambari and restart required services.hadoop.http.authentication.simple.anonymous.allowed=true
Note - Most of the times issue happens because of this property being set as false after disabling Kerberos
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Please also compare below property and see if it is correct.hadoop.security.authentication=simple.Issue is simple but it takes lot of time to troubleshoot. Hence posting this article to reduce someone's time 🙂
