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I've an application that going forward is going to require cross domain authentication using an AD service account across 2 separate organisations - for example domain A application needs to authenticate with domain B backend.

Does anyone know of a way that I could get cross domain authentication working without a domain trust in place between 2 separate organisations - due to security concerns this isn't desirable?

Could AD LDS work in anyway - I believe an AD Trust would still be required? Any other ideas greatly appreciated?

Thanks in advance, PJ

user948548
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    Sure there is. No-one is going to create trusts between two separate companies. Most use federation in this scenario. (ADFS or another solution like Ping). – Greg Askew Jan 04 '22 at 20:13
  • Thanks Greg, but would this work for internal apps that are using AD service accounts, no user interaction (not external facing at all) between the 2 organisations? Thanks JP. – user948549 Jan 06 '22 at 11:20

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