This is a released build of vcva, version 5.5.0.1 GA .ie.,: Patch 5.5.0ba Released on 12/22/13
Could you please post logs. There are various reasons for this kind of issues seen in your environment, can you confirm whether that issues you seen is similar to below KB's described or not?.
1.) Accessing a vCenter Server using Web access or vSphere Client fails with an SSL certificate error (1021514)
2.) Diagnosing the vSphere Client when it fails to connect to an ESX/ESXi host or vCenter Server (1003870)
3.) Connecting to vCenter Server using the vSphere Client fails with the error: The request failed because of a connection failure. (2015014)