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Dynamics 365 Community / Forums / Microsoft Dynamics CRM (Archived) / Calling WebAPI results...
Microsoft Dynamics CRM (Archived)

Calling WebAPI results in 401 Unauthorized Error [C#]

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Posted on by Community Member

Hi there

I'm using this sample:

https://msdn.microsoft.com/en-us/library/mt779074.aspx

I put in my credentials and try to connect to a CRM 2016 Organization but always get 401 Unauthorized.

IIS Authentication; Enabled: Anonymous, ASP.NET, Basic, Windows; Disabled: Digest, Forms.

Fiddler Screenshot:

fiddlo.png

Any help is much appreciated, really struggling with this one.

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I have the same question (0)
  • Suggested answer
    Radu Chiribelea Profile Picture
    Radu Chiribelea 6,667 on at

    Hello,

    Did you also register the app in AD as per: msdn.microsoft.com/.../dn531010.aspx

    Besides the credentials you also need to specify the client id

    Hope this helps

    Radu

  • Community Member Profile Picture
    Community Member on at

    No, is this really needed for on-prem connections?

    I was following this guide:

    https://msdn.microsoft.com/en-us/library/mt770369.aspx#bkmk_prerequisites

    "Access to Dynamics Dynamics 365 Online or on-premises (or later). For all Dynamics 365 installation types, a user account with privileges to perform CRUD operations is required.

    In order to run samples against Dynamics 365 (online), you must register your application with Azure Active Directory to obtain a client ID and redirect URL. For more information, see Walkthrough: Register a Dynamics 365 app with Azure Active Directory."

    No mentioning of registering through Azure AD when using on-premises.

  • Radu Chiribelea Profile Picture
    Radu Chiribelea 6,667 on at

    Hi,

    Are you using IFD? If so, I believe you need to register the app.

    Regards,

    Radu

  • Radu Chiribelea Profile Picture
    Radu Chiribelea 6,667 on at

    If you are not using IFD, are the SPNs set up properly?

  • Community Member Profile Picture
    Community Member on at

    I am actually using IFD, mistake on my part. After setting it up correctly it is now working fine. You sir are a gentleman and a scholar, thank you very much.

    Only thing left now is to somehow pass the credentials while calling the API so I can execute a Console Application without having to fill up the username/passwort prompt.

  • Suggested answer
    Radu Chiribelea Profile Picture
    Radu Chiribelea 6,667 on at

    Hi Kim,

    Thank you for your feedback. I am glad that i could assist you.

    This should be possible with ADFS 2016 if i'm not mistaken.

    Please check a similar thread here: community.dynamics.com/.../268326 - maybe the code there can give you a starting point.

    Hope this helps

    Radu

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