How Can I Host Games On Battle Net (war-craft 3)?

Well you can only host games on Networking or by playing online. Whenever you go for playing games online you can play games online and can host a War craft games by inviting other people to play this games. Most of people host a game on networking where multiple players get access to play games.

I notice date asked, but for the benefit of whoever else sees this, you must enter your IP address in your address bar in the internet screen ( without a "www." ) From there you have to allow ports 6112-6119 to be accessed on both TCP and UDP protocol. From here, internet service may differ the exact way things are done, but you have to make sure that the firewall allows those ports and it should work. If it does not, or these directions are not easy enough to follow, im sure if you searched a little on the internet you can soon end your search and stop wasting time waiting for other people to host maps you like.