Windows2000 Server BDC problem

[arisk]

I have a network with a PDC and BDC. The are exist the following erros
on BDC event log:
error eventID 5722
The session setup from the computer BCH069 failed to authenticate. The
name of the account referenced in the security database is BCH069$.
The following error occurred:
Access is denied.

error eventID 5723
The session setup from the computer BCH068 failed because there is no
trust account in the security database for this computer. The name of
the account referenced in the security database is BCH068$.

Some of the domain users can not connect to the domain.
When i shut down the BDC the problem of user connection to the domain
disappear.
how can i resolve this problem ?

thanks