Cheat Sheet to Troubleshoot SharePoint Provider hosted High-Trust Add-ins – 401, 403, 404, and Misc Errors

Great cheat sheet 🙂

Microsoft Cloud with Nik Patel

Anyone who has worked on provider hosted high-trust add-ins for SharePoint 2013 on-premises environment knows if an environment works, it works like a charm. If it fails, it’s worst thing as IT Pro you may encounter. Most of the errors while troubleshooting provider hosted high-trust configuration are mostly related to authentication and add-ins & SharePoint communication. Many of these errors are so generic like 401, 403, and 404 errors that it can quickly raise the frustration level along with the waste of hundreds of hours.

With this cheat sheet, I am planning to share my usual suspects and hoping to keep it updated as I encounter more weird errors in SharePoint provider-hosted high-trust add-ins configuration.

Microsoft Resources for Troubleshooting Apps

Usual Suspect Areas to look at

  • Expired certs on IIS, local Windows cert store, and SharePoint trust store (including all the chain certs)

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