Domain join problem – Small Business Server 2008

Hi guys,to all the SBS2008 gurus out there,I’d really appreciate your help.I setup SBS2008 Std in our company, successfully joined two machines to the domain.But next day I couldn’t join any more machines. The netsetup log shows an ldap_bind error message (53:Unwilling to perform). This shows on both the machine that I tried to unsuccessfully join to the domain. Then my own machine, the one I initially joined to the domain, gives 1006 errors in my application event log (windows cannot bind to xxxxxx.local domain (Unwilling to perform). Can anyone please help me, please?