Hi
When you click Log In you will submit your credentials to the controller/virtual controller, and this device will send a Radius request for authentication to ClearPass. Check this old tread describing the guest authentication flow:
https://community.arubanetworks.com/discussion/process-of-captive-portal-authentication-with-clearpass-guest-1
Have you configured your self registration page to do pre-auth check? In this case you need to have a service to handle this pre-auth check depending on the type of check you are sending.

Do you get any other messages in the Access Tracker. The MAC auth request should not be sent then you try to log in with the guest account.
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Best Regards
Jonas Hammarbäck
MVP 2023, ACEX, ACDX #1600, ACCX #1335, ACX-Network Security, Aruba SME, ACMP, ACSA
Aranya AB
If you find my answer useful, consider giving kudos and/or mark as solution
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Original Message:
Sent: Jan 12, 2024 04:32 AM
From: a.campbell
Subject: Clearpass - Guest Self Registration with MAC Caching Issue
Hi Jonas,
Thank you for your reply - it is much appreciated.
The Guest User Repository is the authentication source for the MAC caching service, but it is the Endpoint Repository for the MAC authentication service shown below...




Please ignore the hit counts on the services - This morning I connected to a different guest portal / service that I have running and then when I reconnected I then hit the MAC caching service.
For this particular issue that I am referring to, I hit the "Guest-SR MAC authentication" service.
Regards
Original Message:
Sent: Jan 11, 2024 02:49 PM
From: jonas.hammarback
Subject: Clearpass - Guest Self Registration with MAC Caching Issue
Hi
I suppose this error message is from the web login service, do you have the Guest User Repository as authentication source in the service? The error message is [Endpoints Repository] - localhost: User not found, and the Endpoints Repository doesn't have guest users, only MAC addresses. During the MAC authentication the Endpoints repository will be the authentication source.
Can you provide screenshots of both guest services and also the Summary tab of the Access Tracker record?
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Best Regards
Jonas Hammarbäck
MVP 2023, ACEX, ACDX #1600, ACCX #1335, ACX-Network Security, Aruba SME, ACMP, ACSA
Aranya AB
If you find my answer useful, consider giving kudos and/or mark as solution