While I know that a ticket for this already exist I would like to express I have done EVERY step to fix my problem. To remind you my multiplayer was working fine for over a year up to this point. Only after I bought some DLCs 2 days ago this appeared. Not to mention I have legit rebooted my computer and everything. I haven't downloaded anything that would interfere with it or changed any of my computer settings for the matter. I called my internet provider and asked them if they had changed anything to which they replied with no.
Now, I have noticed when I do host a game some people are able to join it and still play with me. But when I try to play with my friends, with whom I live in the same country and even in the same area I can not. I am very confident that the issue is not on my end from what I have seen. Thank you for your understanding and with anything that you can help I'll be glad.