Your network contains multiple domains and you want the Auth Connector to recognize multiple domains. On the AD server where there are multiple domains, the Auth Connector might not see all domains of the forest; and all of the ports are open.
On the AD server where the Auth Connector is installed, navigate to Network and Sharing Center > Local Area Connection > Properties.
Select IPv4 and navigate to Properties > Advanced; in DNS, add the domain name suffix of the domain that the Auth Connector cannot find.
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