Recently (Last two months) upgraded out vSphere server to 5.5. Perodically, I would see a problem connecting using the vSphere client. Now every time I try to connect I get this message.
VSphere Client could not connect to "192.168.x.x". An unknown connection error occurred. (The request failed because of a connection failure. (Unable to connect to the remote server))
I can ping the server and I get this message whether I am using the client on this server or from a client on a different server.