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Patch Management / Patch Tuesday

NPS Authentication Still an Issue for September Updates for Windows 8.1

Last month’s security patches for Windows 8.1/Windows Server 2012 R2 introduced a problem with NPS Authentication. This month is no different, as Microsoft has altered how authentication works in this area – and the issue will probably be ongoing.

This problem exists for both the monthly rollup and the security only update.

If your environment is affected by this authentication problem, Microsoft has provided the following workaround:

On the server, set the following DWORD registry key’s value to = 0: SYSTEM\CurrentControlSet\Services\RasMan\PPP\EAP\13\DisableEndEntityClientCertCheck

If you configured this last month, the setting should have been retained and you won’t need to reconfigure it again.

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