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Small and medium business | Business Central, N...

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NTLM authentication in AL code

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Posted on by AU-06030625-0

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Hello everyone,

I am trying to access an on-prem CRM API from Business Central but am getting an "Unauthorized" error due to NTLM authentication. It works fine when using NTLM authentication in Postman. After investigation, we found that Business Central's HttpClient does not support Windows authentication.

Can anyone guide us on how to access the API?

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Dynamics 365 Business Central

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Gerardo Rentería Ga... 25,555 Most Valuable Professional on at

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Hi, good day
I hope this can help you, and give you some hints.

Solved: How to access custom api in postman using On Premise business central?

Endpoints for the APIs for Microsoft Dynamics 365 Business Central - Business Central | Microsoft Learn

Best Regards
Gerardo

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Khushbu Rajvi. 22,128 Super User 2026 Season 1 on at

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Hope this helps as well: https://community.dynamics.com/forums/thread/details/?threadid=da108a8d-bc2d-4469-bd3b-dd1a1aaae305

https://yzhums.com/18869/

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