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    Who can give me a comparison of different authentication protocols of SFB?

    Friday, July 31, 2020 2:29 PM

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    Hi Shane_Shi,

    Skype for Business Server uses the following authentication protocols, depending on the status and locations of the user.

    • MIT Kerberos version 5 security protocol for internal users with Active Directory credentials. Kerberos requires client connectivity to Active Directory Domain Services, which is why it cannot be used for authenticating clients outside the corporate firewall.
    • NTLM protocol for users with Active Directory credentials who are connecting from an endpoint outside the corporate firewall. The Access Edge service passes logon requests to a Director, if present, or a Front End Server for authentication. The Access Edge service itself performs no authentication.
    • Digest protocol for so-called anonymous users. Anonymous users are outside users who do not have recognized Active Directory credentials but who have been invited to an on-premises conference and possess a valid conference key. Digest authentication is not used for other client interactions.

    For more details, please read this article: https://docs.microsoft.com/en-us/skypeforbusiness/plan-your-deployment/security/user-and-client-authentication.

    Best Regards,
    Sharon Zhao

    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Monday, August 3, 2020 5:36 AM
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    Hi Shane_Shi,

    Is there any update on this case?

    Please feel free to drop us a note if there is any update.

    Have a nice day!

    This  Skype for Business Forum will be migrating to a new home on Microsoft Q&A, please refer to this sticky post for more details.

    Best Regards,
    Sharon Zhao

    Name  forum will be migrating to a new home on Microsoft Q&A! We invite you to post new questions in the new forum.

    For more information, please refer to the sticky post.

    Friday, August 7, 2020 9:27 AM