Category: Networking
- Server has a public IP address assigned.
- Forward DNS A record is already configured for the target hostname.
- You have permission to edit networking or IP details in dashboard.
- Open your server detail page and locate networking or IP management section.
- Find the rDNS or PTR field for the public IP you want to update.
- Enter the fully qualified hostname (for example: mail.example.com).
- Save the setting and wait for dashboard confirmation.
- If required, restart mail or related services that depend on reverse lookup.
- Run reverse lookup: dig -x <server_ip> +short and confirm hostname.
- Run forward lookup for hostname and confirm it resolves back to same IP.
- For mail servers, verify no immediate rDNS mismatch warnings in logs.
- Setting PTR without matching forward A record.
- Using short hostnames instead of fully qualified domain names.
- Expecting instant propagation without waiting for DNS cache refresh.