https://community.cisco.com/t5/network-access-control/ise-dot-1-x-authentication/m-p/5372203#M599857 <P>Some time back i had same issue, my solution is -&nbsp; contact your AD administrator and delete ISE node from AD and add back and test it.</P> Tue, 24 Feb 2026 11:47:54 GMT balaji.bandi 2026-02-24T11:47:54Z https://community.cisco.com/t5/network-access-control/ise-dot-1-x-authentication/m-p/5372200#M599856 <P>Hi, we have ISE for AAA on our network. Recently noticed that new devices are placed on guest network, dot 1x is not being used thus defaulting to MAB. While troubleshooting, I realized&nbsp; on external Identity source in ISE displays as not joined. I tried joining back using an account that had administrative privileges but still getting the error&nbsp; Access Is Denied. Is there maybe something that am not doing it right?</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="img3.jpg" style="width: 400px;"><img src="https://community.cisco.com/t5/image/serverpage/image-id/260142i84E0E45CB389AD2C/image-size/medium?v=v2&amp;px=400" role="button" title="img3.jpg" alt="img3.jpg" /></span></P><P> </P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="img2.jpg" style="width: 400px;"><img src="https://community.cisco.com/t5/image/serverpage/image-id/260143i7EDDDCE29C5156FC/image-size/medium?v=v2&amp;px=400" role="button" title="img2.jpg" alt="img2.jpg" /></span></P><P> </P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="img1.jpg" style="width: 400px;"><img src="https://community.cisco.com/t5/image/serverpage/image-id/260144iB9401F704FC148EC/image-size/medium?v=v2&amp;px=400" role="button" title="img1.jpg" alt="img1.jpg" /></span></P><P> </P> Tue, 24 Feb 2026 11:41:33 GMT https://community.cisco.com/t5/network-access-control/ise-dot-1-x-authentication/m-p/5372200#M599856 Dkiptoo 2026-02-24T11:41:33Z https://community.cisco.com/t5/network-access-control/ise-dot-1-x-authentication/m-p/5372203#M599857 <P>Some time back i had same issue, my solution is -&nbsp; contact your AD administrator and delete ISE node from AD and add back and test it.</P> Tue, 24 Feb 2026 11:47:54 GMT https://community.cisco.com/t5/network-access-control/ise-dot-1-x-authentication/m-p/5372203#M599857 balaji.bandi 2026-02-24T11:47:54Z https://community.cisco.com/t5/network-access-control/ise-dot-1-x-authentication/m-p/5372229#M599861 <P>Do you by any chance have a Server 2025 instance among your AD DCs? That can cause this issue.</P> Tue, 24 Feb 2026 13:10:56 GMT https://community.cisco.com/t5/network-access-control/ise-dot-1-x-authentication/m-p/5372229#M599861 Marvin Rhoads 2026-02-24T13:10:56Z https://community.cisco.com/t5/network-access-control/ise-dot-1-x-authentication/m-p/5372603#M599869 <P>Thank you. Adding the node afresh to the AD solved the issue</P> Wed, 25 Feb 2026 11:49:11 GMT https://community.cisco.com/t5/network-access-control/ise-dot-1-x-authentication/m-p/5372603#M599869 Dkiptoo 2026-02-25T11:49:11Z