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Wired MAC Authentication for some devices not working

Hello,

 

we have a network with about 200 2920-48 PoE switches running well. We have enabled MAC-Authentication against Windows NPS. This is working for the most of our devices.

But some of them are unable to authenticate. The Problem is, i cant see anything in the Aruba LOGs. No request is reaching the NPS. No MAC-Address is shown on the Switchport. If i disable MAC-Auth the device gets active.

 

The config looks like:

interface 1/xx
untagged vlan 11xx
aaa port-access mac-based
aaa port-access mac-based unauth-vid 1
loop-protect
exit

 

As i said, most of our devices (where we use MAC-Based authentication) are working well. They get authenticated by the NPS.

 

Any ideas ?

Thanks,

Ralph

 

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