Form-based authentication still works after you disable external basic authentication in Skype for Business Server 2015

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Skype for Business Server 2015 More...Less

Symptoms

After you run the Set-CsAuthConfig -Scenario BlockWindowsAuthExternally cmdlet in Microsoft Skype for Business Server 2015, the form-based authentication still works.

Resolution

To fix this issue, install the July 2019 cumulative update 6.0.9319.559 for Skype for Business Server 2015, Core Components.

More information

After you apply the July 2018 cumulative update 6.0.9319.534 for Microsoft Skype for Business Server 2015, you can use the Get/Set-CsAuthConfig cmdlets to manage the authentication configuration for your Skype for Business Server. For more information, see:

Use Get/Set-CsAuthConfig cmdlet to manage Skype for Business Server 2015 authentication configuration