Given how the log is very clear about where is the issue, I started to look at my only Domain Controller to check if something was wrong. Error message: Active directory response: The LDAP server is unavailable. Topology discovery failed, error details Active Directory server is not available. Process .exe (PID=1440) Forest contoso.lab. ![]() ![]() Error Details Active Directory server is not available. In addition, make sure that the network ports that are used by Microsoft Exchange Active Directory Topology service are not blocked by a firewall. ![]() WCF request (Get Servers for contoso.lab) to the Microsoft Exchange Active Directory Topology service on server (TopologålientTcpEndpoint (localhost)) failed. After performing the IP change of a Domain Controller, the Exchange Active Directory Topology Service could not start, generating the following events: Event ID 4027 The LDAP server is unavailable.
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