OISHI Hey mate I literally made an account just to reply to this. I have the same issue, also from Australia. Something tells me its a network provider thing (NAT type idk). Ive gotten it to work twice, connected once. Just by luck pretty much. I was alt tabbed, next minute, servers galore. Tried every troubleshooting method under the sun. Ill let you know if anything changes for me or if I find a permanent fix.

Drgn I Already have that

Yalje Try closing background apps.
To name a few:

MSI Afterburner Rivatuner Anti-viruses

spirit he also tell you if it doesn't exist create it.

@Santi134134 Move the game to C:/Games/Black Ops II, re-run piry.exe in the new directory, and close background apps including antivirus.