ACS 5.1 Error Message Help

Unanswered Question
Jul 5th, 2010
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Currently running 4 ACS 5.1 servers to load balance our 802.1x requests, but am getting an error message which is a bit unhelpful in terms of details.


The error message is



11051 RADIUS packet contains invalid state attribute


and only seems to occur on one port port on one particular switch....not quite sure what is causing this for this port as all the other ports on the same switch are not having any issues.


The troubleshooting says



Description
The state attribute in the RADIUS packet did not match any active session.
Resolution Steps
Do the the following: Check the network device or AAA Client for hardware problems or known RADIUS compatibility issues ; Check the network that connects the device to ACS for hardware problems.


The network device is set up the sames as at least 50 other switches in ACS.


The switch port is nominally designated as being for a client PC.


Anyone have any ideas what is causing this error.

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