Lock Down Your Windows Server Security Needs With TekRADIUS

[ Thanks to Amy Newman for this link.

“If you run a Windows Server, you might be able to use IAS or
NPS. In addition to other commercial products, there are free
servers. The most popular is FreeRADIUS, an open source project.
But if you aren’t comfortable with Linux or Unix-like operating
systems, you might consider something else, such as TekRADIUS.”