Details: The server closed the connection. (The underlying connection was closed. The connection was closed unexpectedly)
That means the all the services have yet to load completely. Please wait a while until all the services have been loaded successfully. This usually happens when you just powered on your ESX server and you tried to manage remotely through vSphere Client.
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Your remote router cannot handle more than one connection at a given time. You need to upgrade your router with one that can handle more than one computer at a time. Make sure the router meets your user amount needs.