Windows Server 2016 May security update breaks domain discovery for 15-character hostnames
By
Richard Speed
Not artisan, but a perfectly fine bagel. Hits the spot.
Summary
Microsoft's May 12 security update for Windows Server 2016 introduced a bug where domain controller discovery fails if the server hostname is exactly 15 characters long. The DCLocator calls return ERROR_INVALID_PARAMETER when hostnames hit this specific length, causing authentication and domain lookup failures for administrators.
Key quotes
· 2 pulledThe May 12 security update introduced another bug for administrators to worry about.
When the hostname is 15 characters long, DCLocator calls (for example, using nltest /dsgetdc:<domain> /pdc) will return ERROR_INVALID_PARAMETER, preventing ap
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