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:

 

Windows® 10

  1. Click Start.
  2. Type Firewall and press Enter.
  3. Click Advanced Settings.
  4. On the left frame, click Inbound Rules.
  5. On the right frame, click New Rule...
  6. Select the Port radio button and click Next.
  7. Select the TCP radio button.
  8. In the Specific Local Port field, enter 3724. Click Next.
  9. Select the Allow the connection radio button. Click Next.
  10. Make sure Domain, Public, and Private boxes are all checked. Click Next.
  11. Enter any name for this rule. Click Finish.

Repeat the steps above for each port you need opened based on the above table. Your firewall should now allow traffic on the necessary ports for proper Blizzard Downloader operation.

Windows® 7 and Windows® 8

  1. Click the Start button and type Windows Firewall into the search field.
  2. Click Windows Firewall with Advanced Security.
  3. On the left frame, click Inbound Rules.
  4. On the right frame, click New Rule...
  5. Select the Port radio button and click Next.
  6. Select the TCP radio button.
  7. In the Specific Local Port field, enter 3724. Click Next.
  8. Select the Allow the connection radio button. Click Next.
  9. Make sure Domain, Public, and Private boxes are all checked. Click Next.
  10. Enter any name for this rule. Click Finish.

Repeat the steps above for each port you need opened based on the above table. Your firewall should now allow traffic on the necessary ports for proper Blizzard Downloader operation.

Mac® OS X and macOS®

The firewall in Mac OS X and macOS allows you to control connections on a per-application basis, rather than a per-port basis. This makes it easier to use firewall protection and prevent undesirable applications from taking control of network ports.

  1. From the Apple menu, choose System Preferences > Security.
  2. Click the Firewall tab.
  3. Unlock the pane by clicking the lock in the lower-left corner and entering the administrator username and password.
  4. Click Start to enable the firewall.
  5. Click Firewall Options to customize the firewall configuration.
  6. Check the Automatically allow signed software to receive incoming connections box.
  7. Click OK.

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.