Proxy
To turn off proxy settings in Chrome:
Chrome menu -> Settings -> Show Advanced Settings -> Change Proxy Settings -> LAN Settings -> Uncheck the box "Use a Proxy Server for your LAN" if checked -> Check the box "Automatically detect settings"
To turn off proxy settings in Firefox:
Firefox menu -> Options -> Advanced tab -> Network tab -> Settings -> Select "No proxy" option or "Use system proxy settings" option -> Click "OK" twice