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Inbound REST API authentication options without AAD?

  • September 22, 2026
  • 3 replies
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On-Prem K2 5.9, using on-prem AD as user manager.

Currently K2 API website is load balanced via AWS ALB (which has problem with Kerberos), would need to switch to NLB, but K2 documentation doesn’t mention supporting Windows Auth for the REST API calls.

Is there a plan to support OKTA for Oauth?

This is specially for the Tasks API.

Alternative is to build a separate API using the .NET 4.8 SDK...

3 replies

ScottCaseIT
Nintex Partner
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  • Nintex Partner
  • September 22, 2026

Workflow api or odors? Windows auth is supported on workflow api rest endpoints. https://help.nintex.com/en-US/nintexautomation/devref/5.9/Content/Runtime/WF-REST-API/WF-REST-API-Authentication.htm

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  • Author
  • Rookie
  • September 24, 2026

Workflow API.

OK then it’s the issue of routing it through ALB load balancer then and needs to use NLB.

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ScottCaseIT
Nintex Partner
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  • Nintex Partner
  • September 28, 2026

Some additional information, I have a client that is current having issues with AWS *LB and Windows Auth and are engaging with AWS support. They are working on the flow with basic APIs, so it doesn’t appear to be something unique to K2. I’ll add more info if I hear what the final outcome is. 

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