1.5 Prerequisites/Preconditions
Preconditions for Group Policy: Core Protocol communications between a Group Policy client and Group Policy server are the following:
The server is assumed to be a DC.
The client is joined to the server domain.
For user policy mode, the client is joined to a domain for which the user domain has a bidirectional domain trust.
All DCs in the domain are configured to require signing of LDAP traffic, as specified in [RFC2251] section 4.2.2.