I did a search on this topic but found the threads rather outdated. I'm facing quite a challenge today and this is the scenario... I am on an enterprise LAN running Active Directory. There is a Windows PC beside me and I can login without any problems to the LAN using the AD login credentials given to me by the company's IT group. I am using an MBP on OS X 10.5.6 and I am logged into the MBP using a local account (not an AD account). I have already setup Directory Utility and am connected to the company's Active Directory. This is confirmed in Directory Utility - I have a green light beside the Active Directory Domain and opposite it is the phrase "The server is responding normally." I have also set Kerberos up and I have an active ticket to the AD domain. I then log-off and try to log into the MBP using my AD credentials but it just gives me the shake. My username and password are not accepted - thing is, these are the same credentials I use to log into the Windows PC beside me. Since I am in a forest, I have already tried to logon using "DOMAIN\USERNAME" as my username to no avail. I have played around with the check boxes in the Active Directory advanced settings in Directory Utility but I still cannot login using my AD credentials. I really don'y care about LDAP right now I just need to log into the AD domain using this MBP. Can anyone help? TIA.