The password entered by the user is incorrect.
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The RADIUS server and the NAS are configured with different shared keys.
Solution
Check that:
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The NAS and the RADIUS server can ping each other.
The username is in the userid@isp-name format and the ISP domain is correctly configured on the
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NAS.
The user is configured on the RADIUS server.
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The correct password is entered.
The same shared key is configured on both the RADIUS server and the NAS.
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Symptom 2
RADIUS packets cannot reach the RADIUS server.
Analysis
Possible reasons include:
A communication failure exists between the NAS and the RADIUS server.
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The NAS is not configured with the IP address of the RADIUS server.
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The authentication/authorization and accounting UDP ports configured on the NAS are incorrect.
The RADIUS server's authentication/authorization and accounting port numbers are being used by
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other applications.
Solution
Check that:
The link between the NAS and the RADIUS server work well at both the physical and data link
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layers.
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The IP address of the RADIUS server is correctly configured on the NAS.
The authentication/authorization and accounting UDP ports configured on the NAS are the same
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as those of the RADIUS server.
The RADIUS server's authentication/authorization and accounting port numbers are available.
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Symptom 3
A user is authenticated and authorized, but accounting for the user is not normal.
Analysis
The accounting server configuration on the NAS is not correct. Possible reasons include:
The accounting port number configured on the NAS is incorrect.
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The accounting server IP address configured on the NAS is incorrect. For example, the NAS is
configured to use a single server to provide authentication, authorization, and accounting services,
but in fact the services are provided by different servers.
Solution
Check that:
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The accounting port number is correctly configured.
The accounting server IP address is correctly configured on the NAS.
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