Scenario
A conditional forwarder resolves properly from one DNS server, but not from others in the same environment.
Recommended Resolution Path
- Check replication scope of the forwarder and whether it was stored in AD-integrated config.
- Verify reachability from each DNS server to the upstream resolver.
- Compare firewall, DNS recursion, and root hint behavior between working and failing servers.
- Avoid client-side host hacks until the authoritative forward path is healthy.
Technician Notes
Document what changed, what confirmed the fix, and whether the issue points to a broader standards gap worth addressing for the client.
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Subjects