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ACS 5.3 - 5411 EAP session timed out

I've got ACS currently authenticating wireless users - using EAP-MSCHAPv2.  There are a large number of failures being reported as:

5411 EAP  session timed out


This may be  due to EAP misconfiguration on ACS or Network  Device.

Resolution Steps

Please  contact TAC.

However there does not appear to be any impact to the users as they appear to be authenticating normally shortly after any of these errors.

At this point it's more of an inconvenience but I'd like to see if I can't resolve the issue.  The error says to contact TAC but we don't have a support contract for ACS at this time.

Any help is appreciated.

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