Unknown LDAP host
While Adding Active Directory nodes, you may encounter the ErrorDialURL error on the WSTEP tab of the on-premises agent.
ldap://<DOMAIN-CONTROLLER>
LDAP Result Code 200 "Network Error": dial tcp lookup <DOMAIN-CONTROLLER> on <DNS-RESOLVER-IP-ADDRESS>:53 no such host
The sections below describe possible causes and their corresponding solutions.
Orphaned Domain Controller
The <DOMAIN-CONTROLLER> Domain Controller mentioned in the error might be orphaned. This issue might occur if the Domain Controller was accidentally or incorrectly removed from an Active Directory forest.
Issue resolution: Remove the orphaned Domain Controller as described in https://learn.microsoft.com/en-us/troubleshoot/windows-server/identity/remove-orphaned-domains.
Missing DNS record
The DNS server running on <DNS-RESOLVER-IP-ADDRESS>:53 does not have a DNS record for <DOMAIN-CONTROLLER>. This error might occur after following the Microsoft documentation to solve the orphaned Domain Controller issue mentioned above.
Issue resolution: Add the missing DNS record.