Many customer asked me regarding how to update the SSL Certificate in vSphere 5. Here’s I’m summary KB in VMware for your references. Hope it will help you.
VMware KB 2015387 – Configuring OpenSSL for installation and configuration of CA signed certificates in vSphere environments
VMware KB 2015421 – Configuring CA Signed certificates for vCenter 5.0
VMware KB 2015499 – Configuring CA Signed certificates for ESXi 5.0
VMware KB 1023011 – Replacing SSL certificates for VMware vCenter Update Manager by using the Update Manager Utility
VMware KB 2007824 – After upgrading to vCenter Server 5.0, the vCenter Service Stats and Hardware Status tab cannot be accessed
VMware KB 1013472 – vCenter Server Service Status plug-in cannot be enabled