We experienced the issues with vCenter Client Frequent Disconnects from vCenter Server 5.5 STD.
I already referred everything in the following thread however still No Go.
viClinet Error Log as follows:-
[viclient:Error :W:18] 2015-02-04 19:30:30.449 RMI Error Vmomi.Core.PropertyCollector.WaitForUpdates - 140
<Message>The client did not receive a complete response from the server 'vcenter_FDQN'. (The underlying connection was closed: An unexpected error occurred on a receive.)</Message>
<Message>The underlying connection was closed: An unexpected error occurred on a receive.</Message>
<Message>Unable to read data from the transport connection: An established connection was aborted by the software in your host machine.</Message>
<Message>An established connection was aborted by the software in your host machine</Message>
<Target type="ManagedObject">PropertyCollector:propertyCollector [evcenter_FDQN]</Target>
I finally checked the Network Card on the vCenter VM and changed it from E1000 to vmxnet3 and the issue seems to be resolved now.
Please award pints if the solution worked for you.