This is the easiest and quickest way to solve the Halo Reach matchmaking server unavailability....all you need to do is...
1.go onto...Settings Tab, System settings then Network Settings
2.In network settings, choose configure network...
3.Select the IP address settings then change it to manual
4.Change the last few numbers on IP address to something above hundred (e.g. xxx.xxx.x.[xxx]) the things in the [ ] should be numbers above 100
5.type in your default subnet mask and default gateway then press done
6.Go and change the DNS server now...
7. change the DNS settings from auto to manual..
7a.Change Primary DNS to: 8.8.8.8
7b.Change secondary to: 8.8.4.4
8.Press done and go onto Halo Reach
9.It should work...Thanks for watching
