Answer :



This may happen because of following two reasons: 







The Fortigate Firewall for Direct Internet Access allows only 5 simultaneous authentication requests. In case it receives more than 5 requests, it treats the client machine as infected and blocks the authentication for 3 minutes. This process may repeat and you may never get authentication. 

To avoid this situation, clean your machine from all virus and worms (infections try to access the Internet in the background and generate authentication requests), remove all the Internet applications from Startup menu and do not start multiple Internet applications simultaneously. 




2.    is not set as the Primary DNS. 







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