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Matt-2690 avatar image
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Matt-2690 asked ·

Azure MFA NPS extension 100% CPU usage

I have an NPS server with the Azure MFA extension enabled. While the extension is working properly, after a few hours the dllhost.exe process starts consuming 100% of the CPU. I haven't been able to find any logs that indicate what's going on so I don't have a whole lot more info to present here.

All I can do to resolve the issue is to kill the process and then restart the NPS service. Of course, the problem repeats.

azure-ad-multi-factor-authentication
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amanpreetsingh-msft avatar image
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amanpreetsingh-msft answered ·

@Matt-2690, Please capture a NetMon trace and filter the traffic for dllhost.exe process. I have seen this if there are frequent retries to perform RADIUS auth by RADIUS clients, such as VPN client.

If that is not the case, kill the process, restart the NPS service and capture 2-3 samples of ProcDump while the CPU is spiking up and if you need assistance with dump analysis, please open a support case with Microsoft.




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