Why Does This Issue Occur?
Active Directory (AD) relies on DNS as the primary name resolution system.
Each computer account in AD is linked to its hostname. If the hostname changes, the old DNS entry remains, still pointing to the previous name-IP mapping.
When the client attempts to authenticate using its new hostname, DNS still resolves the old entry, causing authentication issues.
Kerberos Authentication Fails
Windows domains use Kerberos authentication, which issues tickets based on computer names.
If the DNS entry still points to the old name, the Kerberos ticket request fails, preventing successful authentication.
BUGFIX
SOLUTION: efficient troubleshooting saves time and nerves!
DNS is at the heart of Active Directory communication.
Act efficiently: Delete old entries, correct manually, restart DHCP, reboot client.
Work in a time-saving manner: No USB stick required for local password reset, no tedious rejoining to the domain.
DHCP May Cache Old DNS Entries
- DHCP assigns IP addresses dynamically.
- Cached or outdated DNS records can lead to mismatches between actual client identity and AD's expected values.
- A restart of the DHCP service can force a fresh DNS resolution.
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