Update:
Radio sent me this:
Dear Mr.Köller
I am very sorry that you are having problems with Call of Duty 2.
I'm sorry to report that the servers Call Of Duty 2 won't go online again,
If you have any further questions regarding this issue, please contact us via http://support.activision.com. If you experience problems with any of our games, please use the same link to report this to us.
Sincerely,
Davy