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NPS: MaxConcurrentApi

Updated: October 21, 2008

Applies To: Windows Server 2008, Windows Server 2008 R2

You can use this registry setting to alter the number of concurrent authentications performed between the NPS server and a domain controller when NPS is not installed on a domain controller.

Incorrectly editing the registry might severely damage your system. Before making changes to the registry, you should back up any valued data on the computer.

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Netlogon\Parameters

If NPS is installed on a computer other than a domain controller and NPS is receiving a very large number of authentication requests per second, you can improve performance by increasing the number of concurrent authentications between the NPS server and the domain controller.

Add a new entry named MaxConcurrentApi to this registry key and assign to it a value from 2 through 5.

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