You'll often also have the MAC address of the AP too, or if you're running an older wireless infrastructure with no controller, the NAS will be the AP. Looking at a typical log, you'll get a generic "denied" mesage, but you'll also have the ip address of the NAS (Network Access Server), which is usually a vpn gateway, wireless controller or ap - the NAS is often the RADIUS client as well. Network Policy Server denied access to a user.Ĭontact the Network Policy Server administrator for more information. In almost all cases, the NPS Service logs will tell you exactly why, but the reason isn't always presented as easily as it could be. The sort of question I normally get with NPS is "why can't this user access the wireless/vpn/whatever network?", especially when other users can. If you're anything like me, using the grep, find or findstr commands are the go-to method of log access. Most administrators will also store a text log. Many administrators will find NPS logs easiest to access in the Windows Event Viewer, where it's broken out nicely. Where can you find NPS logs? - in a few places actually. Microsoft has supported RADIUS for years as IAS (Internet Authentication Service), and have changed the name to NPS (Network Policy and Access Services) in Windows Server 2008, along with adding a boatload of new features. Without a doubt, when discussing Windows logs the most common questions I get from my clients are almost about authentication, in particular about authenticating Wireless or VPN sessions using RADIUS.
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