NTLM authentication not working

Anoop Rayas 1 Reputation point
2020-07-29T11:34:37.59+00:00

Greetings,
NTLM authentication not working in OnPrem 2016 Exchange. But Basic authentication is working.

With Regards,
Anoop Rayas.

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Joyce Shen - MSFT 16,661 Reputation points
    2020-07-30T02:50:44.53+00:00

    Could you please provide more information about your issue:

    How did you set the NTLM authentication? Did you get any error information after setting this?

    Please also refer to this article to get more information: Outlook Anywhere Basic vs. NTLM Authentication explained

    And the usage and parameter about using the command: Set-OutlookAnywhere

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  2. Anoop Rayas 1 Reputation point
    2020-07-30T11:54:52.92+00:00

    Thanks Joy,
    NTLM authentication is failing for incoming, where outgoing is successful. Please find the attachment.

    14579-ntlm.png

    With Regards,
    Anoop Rayas.

  3. Andy David - MVP 147.3K Reputation points MVP
    2020-07-30T12:09:13.27+00:00

    You are running 2016 CU2. That is more than 4 years old! That needs to be upgraded to CU17 ASAP. You are running extremely old and unsafe code.
    You should upgrade first and see if the issue continues.

    Not sure what this means" NTLM authentication is failing for incoming, where outgoing is successful."

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