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RADIUSAuthentication fails due to multiple auth attempts from Firewall to RADIUS

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Article ID: KB12054 KB Last Updated: 23 Jun 2010Version: 3.0
Summary:
RADIUSAuthentication fails due to multiple auth attempts from Firewall to RADIUS
Symptoms:
Topology:      
FW(11.11.11.1)-------- RADIUS( 10.10.10.1)

Symptom:
Customer sees multiple auth requests coming from the firewall to the RADIUS server. RADIUS sends an 'accept' for the first request, and for the second request it says duplicate request and rejects it.
FW debug auth all shows user is authenticated successfully by the Radius but the user can still not log in.

Event log on the firewall reports the following:
user xyz rejected by Radius 10.10.10.1
Solution:
In this particular scenario the RADIUS retry  timeout on the firewall was set to 3 secs.

Debug showed that the firewall sent auth request at 20:49:17 and received an accept response from RADIUS at 20:49:21 about 4 secs later. Due to the timeout setting to 3 secs, the firewall would send it another auth request at 20:49:20 and the RADIUS would reject the second request.

The timeout value depends on particular network , how far is the firewall from RADIUS server, etc.

In this case the timeout was increased to 7 secs and the issue was resolved.

The command used to change the timeout was:
set auth-server "10.10.10.1" radius timeout 7

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