Tracing ADFS requests/responses using Fiddler: repeated credentials prompts issue

If when using Fiddler to trace requests and responses to ADFS you keep getting prompted for credentials the reason might be “Extended protection” enabled for Windows Authentication for ADFS endpoint you are using. What is happening is well described here: At times you may see ADFS repeatedly prompting for credentials, this could be related to…

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ADFS and "The SPN required for this Federation Service is already set on another Active Directory account" error

If while installing ADFS you are facing the “The SPN required for this Federation Service is already set on another Active Directory account.  Choose a different Federation Service name and try again.” it is probably because you used the “Create Self-Signed Certificate” feature in IIS Manager to create the SSL certificate required by ADFS. The issue…

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ADFS 3.0 service hangs at startup on a domain controller

If you are facing the situation where the ADFS 3.0 (Active Directory Federation Services) service hangs after a restart, the reason might be that the “Microsoft Key Distribution Service” has not started up on-demand as needed by ADFS. This issue seems to occur when ADFS is hosted on a box that is also acting as a domain controller. A…

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