Most proxy servers, firewalls, and other Internet connection methods can restrict port access. Your configuration may be restricting packets from unknown sources. Make sure you have the following ports set up:
 TCP PORTSUDP PORTS
Blizzard Battle.net desktop app80, 443, 111980, 443, 1119
Blizzard Voice Chat80, 443, 11193478-3479, 5060, 5062, 6250, 12000-64000
Blizzard Downloader1119, 1120, 3724, 4000, 6112, 6113, 61141119, 1120, 3724, 4000, 6112, 6113, 6114
Diablo6112-61196112-6119
Diablo II6112 and 4000None
Diablo III80, 11191119, 6120
Hearthstone1119, 37241119, 3724
Heroes of the Storm80, 443, 1119-1120, 3724, 611380, 1119-1120, 3478-3479, 3724, 5060, 5062, 6113, 6250, 12000-64000
Overwatch1119, 3724, 6113, 803478-3479, 5060, 5062, 6250, 12000-64000
StarCraft61126112
StarCraft II1119, 6113, 1120, 80, 37241119, 6113, 1120, 80, 3724
Warcraft II Battle.net Edition6112-61196112-6119
Warcraft III6112 (Default) and 6113-6119None
World of Warcraft3724, 1119, 60123724, 1119, 6012
Call of Duty: Black Ops 4

PC: 3074, 27014-27050
PlayStation 4: 80, 443, 1935, 3478-3480
XBox One: 53, 80, 3074

PC: 3478, 4379-4380, 27000-27031, 27036
PlayStation 4: 3478-3479
XBox One: 53, 88, 500, 3074, 3075, 3544, 4500
Call of Duty: Modern WarfarePC: 3074, 27014-27050
PlayStation 4: 80, 443, 1935, 3478-3480
XBox One: 53, 80, 3074
PC: 3074, 3478, 4379-4380, 27000-27031, 27036
PlayStation 4: 3074, 3478-3479
XBox One: 53, 88, 500, 3074, 3075, 3544, 4500

To configure a firewall for your operating system, select it below:

Blizzard does not directly support proxies, firewalls, or routers. For assistance configuring your router or firewall, contact your ISP or hardware manufacturer. PortForward.com is a useful third-party site that contains port forwarding walkthroughs for most router models.