Error: Unable to contact the Hypervisor

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I came across this error recently when doing a POC for XenDesktop on Vmware ESXi 5.

Error: Unable to contact the hypervisor. Check that the address, user name, and password are correct; the Controller and hypervisor are connected; and the SSL certificates have been set up correctly if you are using HTTPS.

To get around this issue I had to change the Proxy.xml file located on the Virtual Center to accept HTTP communication which is located in the following directory

C:\ProgramData\VMware\VMware VirtualCenter\proxy.xml

Find the following sections of the XML file and change them from "httpWithRedirect" to "httpAndHttps"

Now from the knowledge base article its a tad confusing which part of the xml file you need to change, ignore the id= part and just look for "/" and change the access mode and also look for "/sdk"and change the access mode.

http://support.citrix.com/article/CTX125578