Your server should be able to connect to the database and to the domain controllers so this is no problem.
For the service to connect to the client, the WMI ports should be open.
Here is some more info:
http://msdn.microsoft.com/en-us/library/ms809327.aspx
http://msdn.microsoft.com/en-us/library/bb219447(VS.85).aspx
http://support.microsoft.com/kb/875605/