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Nav database extraction and Linking

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Posted on by CU21050636-1

Hello Experts and Devs

I'm facing a challenge I'm a junior dev under IT i have been asked to link a central machine that uses Dynamic Nav to extract only 4 fields of data from a table that will be then displayed on an HTML display page which we will later be projected on an LED screen to show the extracted information.

but when I try to extract using a services link under Nav I get a 401 error that's related to AUTHENTICATION.
I have tried using the authentication on the domain of the company but I still can't seem to connect but get a "failed to fetch data, 401 error"

Attached to the post is a screenshot of what error i get when i use a services link.

kindly help me fix this.

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Microsoft Dynamics NAV

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YUN ZHU 99,086 Super User 2026 Season 1 on at

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This doesn't look like a NAV error. What external system is this?

The simplest way to think about it is to directly fetch the SQL data and then display it on the page, which has nothing to do with NAV AUTHENTICATION.

Hope this can give you some hints.

Thanks.

ZHU

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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.

Troubleshooting the Dynamics NAV Web Service Data Source – Jet

Error 401 Unauthorized in POSTMAN - Testing NAV 2018 API

Error 401 when trying to acces NAV 2013 Web Service — mibuso.com

Solved: Unable to connect to NAV using ODAta - Microsoft Fabric Community

Best Regards
Gerardo

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Khushbu Rajvi. 22,130 Super User 2026 Season 1 on at

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If this helps: https://community.fabric.microsoft.com/t5/Desktop/Getting-data-from-navision/td-p/4293636

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Sohail Ahmed 11,169 Super User 2026 Season 1 on at

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This looks more like an authentication issue on the web service layer, not a NAV internal error.

Since you're just trying to display a few fields on an HTML screen, a simpler workaround would be to directly query the NAV SQL database and display the values from there — this avoids the whole NAV web service authentication complexity.

If SQL access isn’t allowed and you must go through NAV, make sure:

The NAV service is configured with Windows or NavUserPassword authentication.

Your endpoint URL is correct (/OData/, /SOAP/, etc.).

The account you're using has the right permissions in NAV and access rights in IIS/Service Tier.

Let me know what NAV version you're on and how you're calling the service — I can guide you more precisely.

Mark below checkbox to make this answer Verified if it helps you.

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