In troubleshooting AD connector, i learned the following:
The Primary requirements are:
-Open ports: 53, 88, 389 ( TCP/UDP)
-Service Account that is contained within that Domain ( mult-forest configuration is not supported on the AD Connector )
-Firewall rule allows for the system to connect to the DNS server
-Firewall rule allows for the system to connect to any Domain controller in that domain.
Other things to consider when migrating a domain from one account to another to make it work with AWS Chime:
-Only one domain of your forest and AD Connector directory service can be configured in AWS Chime. If you are using 1 e-mail domain worldwide, if you have 1 domain in each region, you would have to use 4 e-mail domain addresses as proxy addresses for those users in order to authenticate these users worldwide.
-It mentions in the documentation that either the EmailAddress attribute or proxyaddress attribute can be used in that domain of the account. When it comes to migrating to another account, you cannot use the Proxyattribute approach on the users primary account as it has already been claimed as an active domain on the account you are trying to migrate away from. You must delete the domain from the old Chime account in order to make sure there is no conflicts in using the proxy approach.
Since the AD Connector can only be provisioned in AWS, when the service account queries for the IP address of a Domain Controller in that domain , it will than give the IP Address of any domain controller in that domain; even if there is a perfectly suitable Domain controller in the same subnet as the AD Connector. Since the Domain controller in which it queries from is Random, that makes creating the Firewall rules harder to constrain. What worked for us in this case is to temporarily open up the firewall rules so that the connection is not….random and to give it a chance to actually successfully connect. Once it successfully connects, we can think of limiting the firewall rules at that point. Logically we think sometimes it should route to the closest available system for its configuration, but sometimes the program just thinks: “I’m just gonna use any system as it is valid in your list!!!!”