We set up Radius (NPS) about a year and a half ago on Windows Server 2012 and it's been running fine... until now. We're baffled because we're not aware of any changes that have been made.
We are having an issue where Windows devices will not authenticate with our Radius server (NPS). All other types of devices work fine, the issues seems to only impact windows specifically.
The Network policy settings haven't changed, and we've verified that our certificate isn't expired. We are configured for EAP Types: PEAP and EAP-MSCHAP v2.
The error we get in Event Viewer is Event ID: 6273 Reason Code: 16 "Authentication failed due to a user credentials
mismatch. Either the user name provided does not map to an existing user account or the password was incorrect"
Since the username and password work just fine when connecting a smartphones and other devices, it makes me think that the information getting sent back by windows clients aren't in a format that the server recognizes as valid, or the server isn't parsing through the information correctly.
I have spent a lot of time reviewing every article I can find to try and resolve this issue, but no luck yet. Any help would be GREATLY appreciated!