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Go to your control panel > system & security and then Windows Firewall.Also, make sure you're using the login tab when you click 'play game' and keep the page opened and up while you're playing.
There should be an option on the sidebar that says 'Turn Windows Firewall on or off'But if it doesn't let you click then you can troubleshoot.Edit: Quick note: Make sure you're not connected to a network because it might not let you change it to off or on. But this is a last resort to turn it off. Make sure you are seeing if you're using the login tab as stated by others as well.
Yes. If you come to a page that says, 'Keep this tab open to play' then you can try logging into the game itself. Open it up and login. Sometimes waiting a few seconds before logging in to the actual game itself also works.