system
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What is your OS? Do you have another firewall, or have you just been using windows? What other security software are you using? Avast! 6 Free does not provide a firewall; that is only available in the (paid) AIS version. You should turn on the Windows firewall or whatever you were using previously. What is the “other associated service” running-what message do you get? Windows firewall does not need any special rules to allow avast!