It seems to be a bug, Internal Cloudera Jira for reference:   CDH-76040   Cloudera is evaluating the issue and determining the best course of action. Currently, the issue is in CDH 6.1 as well as CDH 6.0x   check out below link:   https://community.cloudera.com/t5/Cloudera-Manager-Installation/HTTP-error-CM-Agent-with-YARN-HA-on-RM-Standby-node/td-p/82719 ... View more