This is where listen servers help, there is a theoretical limit of matches which is equal to the current number of online players, that could be 50 or 1 million matches Peer2Peer hosting only gets used in Private Matches, Zombies and (possibly) Party Games (the gamemodes) But they are only provided by Treyarch and there is no Serverbrowser (The Matchmaking will put you onto a Server). One thing to check on your end is your router.Sometimes routers' default settings can block ports that games like Black Ops 2 need to connect to servers

There are two major ways to check the server status for Black Ops Cold War.

The first is to check the official server status website Activision maintains

Includes 53 items: GUN, Call of Duty, Call of Duty: United Offensive, Call of Duty 2, Vampire®: The Masquerade - Bloodlines™, Geometry Wars: Retro Evolved, Call of Duty 4: Modern Warfare, Call of Duty: World at War, Prototype™, 3D Ultra Mini Golf Adventures, Timeshift, Space Quest™ Collection, Aces of The Galaxy, Call of Duty®: Modern Warfare® 2, Singularity, Call of Duty: Black Ops (ROW), Call of Duty: Modern Warfare 3 (ROW), Prototype 2, Call of Duty® - Black Ops II, Call of Duty.The chilled response from Activision/Treyarch is not surprising, given that Call of Duty: Black Ops was released in 2010, making the game 9 years old.

Commenters are suspicious that Activison have shut down the servers intentionally to make way for their newer games, but failed to communicate this to the playerbase

Bo2 gsc studio not working