HP ProCurve 6120G/XG Configuration Manual page 530

Troubleshooting
Unusual Network Activity
The switch does not receive a response to RADIUS authentication
requests. In this case, the switch will attempt authentication using the
secondary method configured for the type of access you are using (console,
Telnet, or SSH).
There can be several reasons for not receiving a response to an authentication
request. Do the following:
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The switch does not authenticate a client even though the RADIUS
server is properly configured and providing a response to the
authentication request. If the RADIUS server configuration for authenti­
cating the client includes a VLAN assignment, ensure that the VLAN exists as
a static VLAN on the switch. Refer to "How 802.1X Authentication Affects
VLAN Operation" in the Access Security Guide for your switch.
During RADIUS-authenticated client sessions, access to a VLAN on the
port used for the client sessions is lost. If the affected VLAN is config­
ured as untagged on the port, it may be temporarily blocked on that port during
an 802.1X session. This is because the switch has temporarily assigned another
VLAN as untagged on the port to support the client access, as specified in the
response from the RADIUS server. Refer to "How 802.1X Authentication
Affects VLAN Operation" in the Access Security Guide for your switch.
The switch appears to be properly configured as a supplicant, but
cannot gain access to the intended authenticator port on the switch
to which it is connected. If aaa authentication port-access is configured for
Local, ensure that you have entered the local login (operator-level) username
and password of the authenticator switch into the identity and secret parame­
ters of the supplicant configuration. If instead, you enter the enable (manager­
level) username and password, access will be denied.
C-12
Use ping to ensure that the switch has access to the configured RADIUS
servers.
Verify that the switch is using the correct encryption key (RADIUS secret
key) for each server.
Verify that the switch has the correct IP address for each RADIUS server.
Ensure that the radius-server timeout period is long enough for network
conditions.