Michael Webster on Long White Virtual Clouds has posted a handy guide on how to change vSphere 5’s SSL certificates

I’m hoping that the information in this article will help and encourage more people to change out the default certs (to improve security), and make the process far more reliable and easier to achieve with vSphere 5. This article will focus on successfully changing the default VMware SSL certificates on ESXi 5 hosts with CA signed certificates using a Microsoft CA (it will also work with public and OpenSSL CAs, but I have not tested it yet).