Blocking online games

I have been using Cox cable internet for 3 months and playing World of Warcraft and War Thunders without any problems. Suddenly last Saturday I could no longer connect to the game servers. I get on the internet OK but the games will not connect. I have reset the modem, flushed the DNS, shut off the firewall, turned off the antivirus software. Nothing seems to help. When I ping the server or do a path trace it never gets to the router. I need help please