Its a problem with your ps3 connecting to the servers.
As I've seen alot lately on the Treyarch & Callofduty website players with connection problems, like myself. I've taken time to give you some information and what you can do as a fix, until Treyarch release a Hotfix or Patch.
Disable any firewall or security features within your router
Set port forwarding on your router to the IP address of your Playstation 3. This game uses ports 81, 3074, 3075, 3478(UDP) and ports 80, 443, 5223, 3074(TCP). You should also assign your Playstation 3 a static IP address inside your home network, this will help ensure that the configurations you made do not need to be redone. You can get instructions for this at (
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Your friend may also need to follow the above. If your friend has any hardware or software firewalls/routers then he may have issues connecting to you.
If that fails, try this:
1: One player who is hosting the match sends invites to all players who wish to join.
2: Players wait for invites to arrive.
3: After receiving the invites, do not accept them. Have the players logout of PlayStation Network.
4: Restart game and log back on to PlayStation Network.
5: On game title page go to your message sent from the host and click join/accept game invite.
6: This should allow you to accept the game invites.