Port forwarding Are you unable to connect to the game and you are using a firewall , router , or proxy ? Security software such as firewalls and security hardware such as routers are designed specifically to control your computer ' s incoming and outgoing connections . You may need to set up these security features to allow access to the game servers . If these are not set up correctly , the firewall or router may prevent you from connecting to the World of Warcraft / Burning Crusade game servers . You can also check if some of the ports associated with Warcraft / Burning Crusade are being blocked by running the online test found at wow . icannotconnect . com . * Edit * Link not working as of 20141017 . Please note that simply disabling security software will not always allow the game to connect correctly , this is due to a feature with most security software in case a virus disables the security software without you realizing it . Configuring security software is preferred , however removing it completely can be used as a test to see if it was blocking the game . Please note that Blizzard does not offer direct support for proxies ( Internet connection sharing ) , firewalls , or routers . The settings provided are suggested settings only . You may need to contact your Internet Service Provider or network administrator for assistance if you have opened the correct ports but still cannot connect . It is also recommended that you contact your router manufacturer for updates that may help to resolve some connection issues . Here are some common questions and answers regarding proxies , firewalls , and routers . What do I need to know about ports ? Anytime your computer receives incoming data , it is sent to a " port " . Your computer has many ports that can receive data , and different activities will utilize different ports . World of Warcraft & Burning Crusade use TCP port number 3724 to play and UDP port 3724 for in game Voice chat . The Blizzard Downloader , which downloads patches , also uses TCP ports 6112 and the range 6881 - 6999 . For walkthroughs on router and firewall configuration you can use the Help for the Blizzard Downloader page . How are ports restricted when using a proxy , firewall , or router ? Most proxy servers , firewalls , and other Internet connection sharing methods can restrict port access . Your configuration may be restricting packets from " unknown sources " . In this case an " unknown source " would be defined as any IP address that you have not initiated the contact with . Once you contact the IP address , your proxy and / or firewall considers it " safe " , or a " known source " , since you initiated the contact . How do I configure my Operating System firewall ? Windows XP and Mac OS X ship with firewall services built into the operating system . While these services are disabled by default , if you have turned these services on , you may need to configure these services to allow the game to access the Internet . We have step - by - step instructions for configuring these firewalls to work with the game . Some firewall programs have preset ports available in their configurations that are often necessary to be open . One in particular is a connection to your DNS server . This usually takes place on UDP port 53 . Some other popular Security program configuration guides can be found here : What do I do if I am still having problems connecting using a firewall , router , or proxy ? If you need further help configuring your firewall , router , or proxy first please try to reset your router and modem by following these instructions here . Afterwards you may need to contact the manufacturer for more specific assistance Additional firewall and port forwarding guides can also be found at portforward . com . You will need to search for your specific device or software and follow the instructions listed there . If you still have trouble setting them up , please contact the manufacturer for additional assistance .