Riot please fix Firewall issue

So basically I can't play League of Legends on my computer anymore... Everytime I start a game it says Cannot connect to server. Is firewall blocking he connection or something like that. And this is a real issue cause I keep on getting banned. Riot please fix this issue. Or make a page to where I may see the fixes to the issue. I have tried all the fixes on youtube but they seem pointless. Thank you for your time.~FindingTeemos