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

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Posted on by Shrey Chauhan

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Hello Sir/Ma'am,

I am trying to consume custom api of on premise business central in postman, However its showing the data on frontend as below image :

But same I am trying to call using postman using Basic Auth and also Tried the NTLM Authentication it's showing as 401 Unauthorized as below image :

As NTLM Authentication

I have also enabled all the permission in Administration Shell like :
Enable NTLM Authentication
Enabled Soap Services
Enabled Odata services
Enabled API services

Please help me to solve this problem

Your efforts is appreciated
Thank you for your valuable response and time

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Dynamics 365 Business Central

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Ariba Mehdi 166 on at

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Hi there,
After enabling these, restart the BC service, and try NTLM authentication. It is working with me.

Also, try writing the username without the domain. It works with me.

Make sure you have restarted the BC service after editing the server.

Hope this helps!

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YUN ZHU 95,729 Super User 2025 Season 2 on at

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Just add some information:

How to use Postman to connect to Dynamics 365 Business Central On-Premises

https://yzhums.com/18869/

Thanks.
ZHU

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Aakib khan 122 on at

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Kindly change the current authentication type from windows to nav user password in the config settings/settings file in business central folder on in the business central server app.

Or you can create Are you user with the authentication type as nav user Password And login with that user After changing the authentication type from Windows to nav user password Restart this server and do you log in it using your username and password.

1: You can also create A new user with authentication type Username password using this video :
https://youtu.be/EqiuT_au_UM?si=Do10u6DY4wrfJkOw

2: After creating the username password You need to restart the server and and web services api key and use Credentials Of basic auth Username as your username of Business central and password as the web api key.

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