Hi Johnathon,
I'm very sorry you are having issues with Avast.
Could you please help us with the investigation by providing some data?
Please try disabling Avast shields one by one (e.g. disable firewall and connect to Call of Duty server, if it doesn't help disable web shield, connect to CoD servers and so on) and post here the shield that is responsible for connecting problems.
Thank you very much,
HK