what is wrong , authentication is failed and the mesage is this:
Authentication Failed : Proxy failure
Go to Network Configuration > Under "Network Device Groups" click on "(Not Assigned)"
Under "(Not Assigned) AAA Servers", note down the entry name for your machine's IP address, which can be confirmed from DOS command prompt
using command "ipconfig/all"
Then Go back to Network Configuration > Under "Proxy Distribution Table", click on "(Default)"
And make sure AAA server name entry for your machine is in "Forward To" column. If its not, then move your machines entry to the column, and make sure that all other entry is under "AAA Servers". Then press "Submit + Restart"
Finally, try to authenticate few client against this ACS server.