How to call NTLM aauthentication enabled rest service from Azure Logic apps/ Azure function app

Question

Hi

we have rest service running on onpremise with NTLM authentication enabled, we have requirement to call this service from Azure logic apps/ Azure function.

Can you please guide me on this implementation.

Answer 1

Hi,

I found a blog post that explain how to do NTLM authentication on a rest api:

https://weblog.west-wind.com/posts/2021/Nov/27/NTLM-Windows-Authentication-Authentication-with-HttpClient

This is for c#. You should be able to find something for other languages too.

Hope this helps!

Answer 2

@Amar-Azure-Practice Thanks for reaching out. Azure logic app doesn't HTTP connector doesn't support NTLM authentication. From function perspective you can leverage hydbrid connection to connect to your on onpremise service. You can refer to this document to create the hybrid connection and how it works. The hybrid connection is not supported in Consumption Plan and works with Windows OS for azure function with other plans as mentioned in this article. You need to create the function app under the app service plan.
Reference: https://learn.microsoft.com/en-us/azure/azure-functions/functions-networking-options#matrix-of-networking-features

I haven't tested the NTLM authentication, but I think the Cristian shared third party article talks about how you can pass the credential and as per NetworkCredential class it does support NTLM authentication schemes.