I am trying to download Diablo 3 to be ready at the release date, but I have a problem with the Blizzard Downloader. Unfortunately downloading is very slow and there is a yellow message that says "A listening port could not be opened".
I clicked help and tried to set up port forwarding as explained, but the warning message persists. How can I solve this problem?
Best Answer
According to this you need ports 6881-6999 open for peer to peer traffic. Make sure your computer and local routers have these unblocked (or at least, properly forwarded). Most routers also have a "DMZ" option for computers, which you can temporarily place your computer in for unrestricted access to the internet. Search Google for "[your router name] DMZ" to learn how to enable this.
Unfortunately, these are common bitTorrent ports and your ISP might be throttling or blocking these ports. If you go to View > Connection Info in the downloader you can see where the problem lies. Most likely only the "Direct Connections" are available and no other "peers".
Your best bet in this case would be to copy the client from a friend who has downloaded it, change your internet service provider or use a proxy.