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Call of Duty 4: Modern Warfare Question

Error: Unable to connect to Activision Matchmaking [Error 33]?

Does anyone have a solution to this? COD4 was working fine earlier today and now it keeps telling me this. Same with LBP.
Top Voted Answer
Whenever you see a problem with online in CoD4, try the following in order, and usually they work:

1. Exit out of "Play Online" menu, and go back in.
2. Exit out of "Multiplayer" menu, and go back in.
3. Sign out of the Playstation Network, then sign back in.
4. Restart CoD4.
5. Restart your internet by running an Internet Connection Test under Network Settings, and check for an error message.
6. Sign into a different Playstation 3 account (and a new online account), and try playing, then switch back and compare the two.
6. Restart your Playstation 3.
7. Restart your modem and/or router (if you control said devices, otherwise ask whoever runs your internet for help). Also work with said network manager to try and solve the problem.
8. Look around and/or post in the Playstation 3 boards for help.
9. Google search the error.
10. Try playing the next day (sometimes errors go away by themselves)

I'm sorry I don't have specific information on that problem, but that list is a pretty much tried and true method (I think I've seen that error before, and it's not bothering me now, so it's obviously been solved somehow) that works with just about any given network or online-based error.
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