If you create a new site that does not yet contain a domain controller, an Event log on some domain controller will contain:
Event Type: Information Event Source: NETLOGON Event Category: None Event ID: 5784 Date: 1/24/2001 Time: 1:17:47 PM User: N/A Computer: <SomeSiteDCn> Description: Site <NewSite> does not have any Domain Controllers for domain <DomainName>. Domain Controllers in site <SomeSite> have been automatically selected to cover site <NewSite> based on configured Directory Server replication costs.This is normal behavior.
When you promote a domain controller in <NewSite>, the domain controller that was temporarily covering <NewSite> logs the following event:
Event Type: Information Event Source: NETLOGON Event Category: None Event ID: 5785 Date: 1/25/2001 Time: 3:47:09 PM User: N/A Computer: <SomeSiteDCn> Description: This Domain Controller no longer automatically covers site <NewSite>.The is also normal behavior.
If you happen to review the DNS SRV records, you will notice that <SomeSiteDCn> is still listed as the domain controller in <NewSite>.
When NETLOGON issued event 5785, it should have cleaned up the old records.
To resolve the issue, manually delete the incorrect DNS SRV records.