Protected by an authentication firewall

1 reply
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Hi All,

I have setup FAC as a RADIUS server and connecting AD using LDAP. The FAC has joined the AD domain and FAC able to retrieve the user from AD domain. When I try to authenticate user using 802.1x, it shows the authentication failed due to the machine you are logging onto is protected by an authentication firewall.

May I know if anyone encounter this issue before and what could be the possibility that causing this issue?

Screenshot 2024-08-14 152600.png

ozkanaltas

Valued Contributor III

Hi @chinlong ,

I hadn't faced this issue before but when I did some research I found an MS article related to this issue. This article also provides solution steps. Can you try these solution steps?

https://learn.microsoft.com/en-us/troubleshoot/windows-server/windows-security/tgs-request-for-krbtgt-account-fails

Also, sometimes FAC can be dropped from the domain. In such cases, I change the FAC's machine name and have it re-join the domain.