I have MacBook Pro but I cannot use my FaceTime

I have tried but my facetime is not working. 

I am using a Macbook Pro, MAC OS X 10.6.8.  I downloaded Face Time through Itunes and when I try to login, I get this error message: "Could not sign in.  Please check your network connection and try again."  My apple ID is correct, I checked.  I am using my WiFi with all other apps and I'm fine except with Face Time.  Ideas?

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