Lan with Windows 7

When I try to join a LAN world that is being hosted on a Windows 7 computer, it says "Connection timed out: connect"

What I expected to happen was...:
I expected to join the LAN world

What actually happened was...:
Minecraft said "Connection timed out: connect"

Steps to Reproduce:
1. Host a LAN world on a Windows 7 computer
2. Try to join the world on a different computer
3. If it joins with no error, leave the world.
4. wait a while (10 minutes should do)
5. try joining again.