recently, i was unable to reconnect a host to vcenter using the usual troubleshooting methods. couldn’t find any clues as to what the problem was from the logs. the only thing noteworthy was something similar to “could not resolve version for authenticating to host agent” in the vpxa logs. i also couldn’t connect the vcenter client directly to the host either.

i eventually found this article:  https://www.igotitworking.com/problem/view/91

and after initiating a esxcfg-rescan vmhba35 from the host i then could magically rejoin it to vcenter.

note: this article was written with ESX 4.0 in mind, if this doesn’t resolve the issue try the other suggestions listed in this post – http://resinblade.net/wordpress/?p=1539

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