help moving forums
 

i have i forum with some subforums on one domaine

domain A

since some of this forums needed to be moved from this domain to a new one (only some) we bought a new licence to move all user profiles and forums to domain B


and i proceded in this way:

make new installaetion on server B
dump db of server A
delete and reinport db on server B

now i can't login on server B admincp

it logs me in and then return me on login form :(

i don't know how to solve it