NPS Server Errors

Question

_{Thursday, May 30, 2013 6:24 PM}

I have a single Windows 2008 R2 Standard server running NPS configured in my environment. The NPS server has 4 clients configured ( 4 wireless controllers).  Everything is working well, no issues there. 

However, for some odd reason; everyday at about the same time, the server will log 8 consecutive errors each for 2 different IP addresses in the event log.

Event ID 13 : A RADIUS message was received from the invalid RADIUS client IP address X.X.X.X

This error is always logged with the same 2 IP addresses.  8 errors for each IP. The IP's belong to a fileserver and an XP workstation running a print server.

Neither of these have anything to do with the RADIUS server, they are not clients and I cannot think of any reason they would be trying to contact it.

Any ideas what could be causing these messages from these seemingly 2 random IP's?

All replies (3)

_{Friday, May 31, 2013 3:37 PM ✅Answered}

Thank you for the reply.

All clients are setup via IP and not via DNS.  However, I did check the FQDN of the clients anyway and they do map to the correct IP's.  It doesn't appear to be a DNS issue (at least in relation to improper FQDN).

Strange.  I am continuing to look into.  Will report findings.

_{Friday, May 31, 2013 7:36 AM}

Hi,

Thanks for the post.

Based on my research, the issue maybe related DNS, please check if FQDN of your RADIUS clients map to wrong IP address.

Event ID 13 — RADIUS Client Configuration

http://technet.microsoft.com/en-us/library/cc735406(v=ws.10).aspx

Hope this helps.

Jeremy Wu
TechNet Community Support

_{Monday, June 3, 2013 5:42 AM}

Hi,

I would like to check if there is any update.

Thanks.

Jeremy Wu
TechNet Community Support