Straight from the Executive Producer himself:
While I’m delighted that people are having a blast with the single player campaign and skirmish modes of the game, I’m disappointed that we’ve had some teething problems with the online multiplayer. Most of our customers are able to play on-line, but I know that a number of you are having trouble - and I owe you an apology. Some of you can’t connect to C&C Online and others are having issues once on-line. This is unacceptable, especially for a product that we designed for competitive multiplayer game play. I am sorry that you are encountering problems and I want you to know that the development team is working very hard to understand the issues, fix the bugs that affect the largest numbers of people, and roll out patches as quickly as possible.
We have issued one patch already and we have two more in the works. I believe we have a bead on the issues that affect the most people and I expect that we will solve these problems in a matter of days.
Just to be clear: Not everyone is having problems playing on-line… the majority of people are able to get online, play games, and a have a great time. For those that are having problems, please bear with us. We will fix these issues and make C&C the great online multiplayer game it was designed to be – and we ask for your patience as we work through the issues.
Hopefully this will get resolved soon. In the meantime, there's always the campaigns.