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NPS An Access-Request message was received from RADIUS client with a message authenticator attribute that is not valid.

Posted on 2013-02-04
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Last Modified: 2013-02-07
Hi all,

Im trying to authenticate wireless clients using EAP-TLS, ive got the access-point to send the authentication message to the RADIUS server and have captured the packets (see pic) but the radius server is throwing an error

"An Access-Request message was received from RADIUS client x.x.x.x with a message authenticator attribute that is not valid."

Ive attached screens of my polices and my wireless profile, pretty much everything i can think of, hopefully someone can point me in the right direction.

Thanks
profile.PNG
settings.PNG
settings.PNG
wire.PNG
client.PNG
Connection-Reqs.PNG
Network-Pol.PNG
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Question by:awilderbeast
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footech earned 500 total points
ID: 38851662
The first thing I would check is the shared secret.  Make a new one and paste it into the config of both your NPS and NAS (WAP).
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by:footech
ID: 38851931
Also, I believe you may run into issues authenticating wireless clients with your Network Policy, specifically with the attribute Service-Type: Login.  I believe this should only be set on a policy that you are configuring to handle authentication requests to login to the RADIUS client (i.e. WAP).
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by:awilderbeast
ID: 38864603
ok ive checked the shared secrets they definitely match
Ive removed service-tye:login from the radius server, im still getting the same error though

any ideas?
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by:awilderbeast
ID: 38864668
Hold that, its working, i changed the radius key, i had a $ in the password, removed that and it works!

thanks
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Author Closing Comment

by:awilderbeast
ID: 38864671
no $ in password was needed
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Expert Comment

by:footech
ID: 38865117
Glad you got it working.
I've never seen that as a requirement.  I know NPS supports the $ character.  I wonder if it's a limitation of your RADIUS client.  I haven't seen any mention of it in Cisco docs.
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