Just for the record: This method does not function anymore as the BF2-Code in the registry is encrypted.

Is there a method that currently works? Only I've just installed it and I have exactly the same problem: BF2 works fine, but can't join the only populated server on FH2 (or unpopulated ones). I originally had the problem with BF2 but fixed it with one of the many proposed solutions (one of the CD Key changer applications). I can't find one that works for this. In fact, all the solutions out there are aimed at fixing the problem for BF2, and since I've done that, it's hardly surprising they don't make a difference with FH2. Even went into the registry and retyped the key, but it looked like it was correct before I did that.