We often get asked from time to time how to force printers that a user has installed on their workstation using the IPP website to use RPC in lieu of the Internet printing protocol. There is a document available on TechNet that explains how to accomplish this:
(It’s as simple as changing the IE Zone Security to Medium-Low)
Often though, we run into customers who have already customized the settings in their IE Zone security and would still like to force the use of RPC for IPP printers without resetting those IE Zone settings to Medium-Low.
So what settings is the IPP printer really checking to accomplish this?
The process Windows uses to decide how to connect to a printer looks like this:
1. The OS checks if the following Registry Key is set: