Slow download speeds using the Blizzard Downloader
If the Blizzard Downloader is downloading a patch but you are experiencing very slow transfer rates, we ask first and foremost that you be patient. The nature of the Blizzard Downloader is that it takes a few moments to make the connections necessary for the transfer. If you are still experiencing extremely slow downloads after 10-15 minutes, please try the steps below.
1.
Closing Background Applications
Click here for instructions on closing all background applications, then try restart the downloader. If the download speed continuesto be poor after several minutes, then proceed to step 2.
2.
Firewalls*
If you have a firewall, be sure that it is set up to allow for incoming connections on
Ports 3724,
6112, and
6881-6999 for the
TCP (also called TCP/IP) protocol. More information on how to open ports for some popular firewalls can be found on our
Firewall configuration pages. If your firewall is not listed there or you need more help, please refer to your firewall documentation or contact the manufacturer.
Important note: Please be aware that many popular firewalls will become very restrictive to traffic when disabled. Please be sure any firewalls you have installed are configured correctly and enabled in order to use the downloader effectively.
3.
Routers*
Be sure that the router configuration has
TCP Ports 3724,
6112, and
6881 through 6999 forwarded to your computer, and only your computer. Having the same port forwarded to more than one computer connected to the router can cause a conflict, which may result in slow download speeds. More information and instructions on how to forward ports for some popular routers can be found on our
Blizzard Downloader Networking Help page under the Routers section.
Be sure that no computers are in the DMZ (demilitarized zone). If a computer is set up to be in the DMZ, then there may be a conflict, which may cause slow download speeds. Be sure that any other computers on the network are not running any programs that utilize large amounts of bandwidth. Remember that a router simply lets all of the computers connected share the connection. It does not increase the bandwidth of the connection!
4.
Adware/Spyware/Virus Scan
Adware/Spyware or a virus on your system may also cause these symptoms. Be sure to run full scans of your system with the latest definitions for your malware programs.
5.
Visit the Technical Support Forums
If your problem persists, please visit the
World of WarCraft Technical Support Forum for a possible solution. * Blizzard does not offer direct support for proxies (Internet connection sharing), firewalls, or routers.The settings provided are suggested settings only. If you continue to have issues while connected to a routeror while a firewall is installed, please contact the manufacturer.
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