check your proxy settings; under Windows 7 you can find those settings in the other.xml file present under the path C:\Users\YourUsername\\.AndroidStudio\config\options . Note that if you turn both options "USE_HTTP_PROXY" and "USE_PROXY_PAC" to true the error keep coming but a pop-up should come out noticing the problem of a double configuration and prompting a resolution with a input window for those settings.