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Postman Authentication for On Premise Business Central OData

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Posted on by Community Member

Hi ,

We were validating On Premise OData for Business Central entity. When we use the option to validate using GET with NTLM Authentication we get 401Unauthorized error - see below image.

We are Using Microsoft Dynamics 365 Business Central 2020 Release Wave 2 and Authentication with a Domain\username and secret web access key.

Please suggest what can be the missing part here.

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YUN ZHU 82,927 Super User 2025 Season 1 on at

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RE: Postman Authentication for On Premise Business Central OData

Hi, I re-tested it, and it seems that there is nothing wrong with it.

Just in case, please check the following options again.

Hope this will help.

Thanks.

ZHU
Community Member on at

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RE: Postman Authentication for On Premise Business Central OData

Hi YUN ZHU ,Thanks.

Tried as you mentioned. But still getting 401 when I have tried with Windows authentication.
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YUN ZHU 82,927 Super User 2025 Season 1 on at

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RE: Postman Authentication for On Premise Business Central OData

Hi, is "Use NTLM Authentication" enabled on Business Central Administrator.

Hope this will help.

Thanks.

ZHU
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raelhefn on at

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RE: Postman Authentication for On Premise Business Central OData

Hi, It should works if you enable NTLM Authentication.

For more information, please take a look at this similar post, community.dynamics.com/.../how-to-use-basic-authentication-to-access-web-service-in-d365bc-server-in-a-vm