When I right clicked on ESX server it was prompting me to connect to host option...but in logs it was disconnected host on user's request.
i'm not quite sure I understand, but if the host was disconnected manually, the correct option when you right click would be connect. Are you trying to determine who disconnected the host from vCenter?
I was just analysing my virtual environment....in alarm tab there was 3 alerts...one of my host was showing as red. I right clicked on my host, i could see only one option and that was "connect'. which means host is not connected to VC. I clicked on connect but the action did not work..I have resolved that issue later...When I analysed the log, first log was " host disconnected from VC : Requested by user " and there was my account name.
Any expert's comments ....?