We had a problem similar to this with out test environment. It comprised of 1 Server 2003 (acting as DC,DNS,and DHCP), 1 OD master, and one osx client. AFP worked fine over the OD master just when we tried to hit any SMB share on the DC it would give us wrong username and password. Issue had to deal with a GPO on DC’s a.
if you browse to these location….MAKE SURE THEY ARE DISABLED!
Default Domain Controller Security Settings -> Security Settings -> Local Policies -> Security Options -> Microsoft network server: Digitally sign communications(always)
b. Default Domain Security Settings -> Security Settings -> Local Policies -> Security Options -> Microsoft network server: Digitally sign communications(always)
after we set these GPO location to disabled all is well with SMB/CIFS on a DC.
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