VMware vSphere Client Cannot Connect

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http://serverfault.com – When I try to connect to a couple of our ESXi servers with my vSphere client I get the following error message: "vSphere Client could not connect to "IP Address". An unknown connection error occurred. (The client could not send a complete request to the server. (The underlying connection was closed: An unexpected error occurred on a send.)) I'm thinking this may have something to do with a version incompatibility but I'm not sure. Can somebody shed some light? (HowTos)