Domain NT4 - 2000 approbation failed

Hi,

I have approved an NT4 domain in a w2k domain and the win2k domain in the
NT4 domain.

No error occured when I created the approbation. But when I click the
'Check' button in Win2k, I have a message 'access denied'

When I try opening a session on a machine, I can choose one of the two
domains I created. But I can't log into the new domain, and I get a message
telling me the approbation failed.

I can't access a machine from the other domain through the network either,
even if I can see it in the network.

I tried twice to create the approbation (NT4 approoving Win2k and vice
versa) but I get the same result.

Can anybody help me ?

Thanks.
Simon.