When connecting to an Active Directory, the Smoothwall will need access to a range of services on all Active Directory servers that in the domain. The Smoothwall doesn't need to access member servers, only Active Directory domain controllers.
List of ports
When an Active Directory connection exists on a Smoothwall installation, there are diagnostic tools available that will show if the services are reachable. Place your mouse cursor over the Active Directory connection in "Services - Authentication - Directories" and the diagnostics button will appear. Click this and look through the results. All Active Directory servers will be listed and if there are problems reaching any of the service ports, that will be shown.
The services and ports required are listed below with notes.
Port 88: Kerberos
Port 135: RPC Locator
Port 139: NetBIOS Session - not essential. Authentication will work without.
Port 389: LDAP
Port 445: SMB/CIFS
Port 636: Secure LDAP