Please read this post by FrankieV and just as I suggested Delliance read the whole topic too. http://www.urbanterror.info/forums/topic/33474-rc-urt-43-release-candidate-4/page__view__findpost__p__366308
go to console (tilde key above your tab key)
type
/cl_master
and check if you master server is master.urbanterror.info
if it's different type
/cl_master master.urbanterror.info
http://www.urbanterror.info/servers/master/