Actually, I have been having this problem with all my characters, since I got the game, but it is random with me. Like for instance, I tried to create a Sylvari, but after defeating the boss this code comes up, then I have to do the intro mission over and still have the code come up.
I had this problem with my Asura, but for some reason, I was able to eventually able to actually move forward in the story after clicking play enough, but I have no idea as to why. I am able to do some story missions without fail, but then suddenly the message will pop up, and I am kicked out.
The message says somehing about being blocked by a firewall, but my computer isn’t blocking anything that is Guild Wars 2 or Arenanet related. And changing servers has no effect either, I’m sorry if I cannot help, but hopefully if enough people with this problem post about it, then Arenanet will notice and can figure it out, hopefully…