After two days of frustration and innumerable dead ends, I finally found the solution to why I could not successfully intall the “RPC over HTTP Proxy” feature on my brand new WS2008R2 server. After reading dozens of obliquely related posts, I stumbled upon one that provided the hint that led me to the solution.

In my login script, I modify the following registry key to adjust my CMD processor defaults to the settings I prefer:

HKEY_LOCAL_MACHINESOFTWAREMicrosoftCommand ProcessorAutorun

Big mistake! Because of the fact that there was an entry in the Autorun key, the “RPC over HTTP Proxy” feature refused to install!

The solution? Delete the value from the Autorun key, and then add the “RPC over HTTP Proxy” feature.

I hope this saves someone else a bit of the grief I went through trying to eventually get to where I could install the Remote Desktop Gateway role service!!!