As the GUID is banned on the new key then yes, It's useless, blame Activision for that.
Your old GUID/Key 3d1842c59d5d74f0de6529141492f704 (first seen - Jul 24, 2006 / last seen - Jan 28, 2009)
is not on the PBBans, Punksbusted or Game-violations banlist nor is it global banned by EvenBalance, so...
Would suggest the Admin of that server has banned you.