I have a Windows Server 2008 R2 Network Policy Server (NPS) configured to use a remote RADIUS server. In the event that the remote RADIUS server doesn't respond to 5 (configurable) consecutive requests, the server is marked as unavailable and stops attempting to contact it. I'm having difficulty understanding what process occurs for it to decide to re-attempt contact with the previously unresponsive RADIUS server. Is it a simple timeout or can I manually add it back to the pool of available servers?
Log Name: System Source: NPS Date: 2/19/2013 4:37:29 PM Event ID: 36 Task Category: None Level: Warning Keywords: Classic User: N/A Computer: SRV1.domain.local Description: The remote RADIUS server 10.20.30.40 has not responded to 5 consecutive requests. The server has been marked as unavailable. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="NPS" /> <EventID Qualifiers="32768">36</EventID> <Level>3</Level> <Task>0</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2013-02-19T22:37:29.000000000Z" /> <EventRecordID>2127</EventRecordID> <Channel>System</Channel> <Computer>SRV1.domain.local</Computer> <Security /> </System> <EventData> <Data>10.20.30.40</Data> <Data>5</Data> </EventData> </Event>