The ranting of an IT Professional » HA agent has an error : cmd addnode failed for primary node: Internal AAM Error – agent could not start. : Unknown HA error error2011-09-19T18:30:04Zhttp://itknowledgeexchange.techtarget.com/it-rant/feed/atom/Jason Tramerhttp://itknowledgeexchange.techtarget.com/it-rant/http://itknowledgeexchange.techtarget.com/it-rant/ha-agent-has-an-error-cmd-addnode-failed-for-primary-node-internal-aam-error-agent-could-not-start-unknown-ha-error-error/2011-06-15T19:22:25Z2011-06-15T19:22:25ZGot the error on a vSphere 4.1 host. I have three hosts in the cluster and the other two are working fine. After doing some investigation I edited the \etc\hosts file on the vSphere hosts and found it had the wrong IP address for one of the hosts in the cluster. Fixed that and issued a reconfigure HA command to the host resolved the issue!