LHA Consulting, Incorporated

Just throwing this out there so that it's more Google-able.

There was a Windows Update that fracks with the way ephemeral ports are handled on a DNS server, so if you're installing an LDS instance on a DC that's running DNS, and using the default ports of LDAP/50000 and LDAPS/50001, you can get unpredictable errors. Description of the issue here:

http://support.microsoft.com/kb/959215

Solution is to reghack the DC and reserve the high-level ports that you want, as listed here:

http://support.microsoft.com/default.aspx?scid=kb;EN-US;812873