What does Windows error code 9567 (DNS_ERROR_DWORD_VALUE_TOO_LARGE) mean?

DNS_ERROR_DWORD_VALUE_TOO_LARGE

The specified value is too large for this parameter.

DNS_ERROR_DWORD_VALUE_TOO_LARGE is Win32 error 9567 (0x0000255F).

Likely impact: Silent truncation or clamping can produce unexpected cache, retry, or aging behavior.

Typical causes

• seconds were converted to milliseconds twice.
• a signed value became a large unsigned DWORD.
• configuration input exceeds the server limit.
• a template was written for another version.

Troubleshooting steps

1. Verify that the DWORD value lies within the documented maximum and does not overflow a unit conversion.
2. Collect property name and submitted value and documented maximum and unit.
3. Correlate conversion path and source type with the DNS Server event log, DNS analytical logging when enabled, packet capture, zone metadata, server configuration, and the exact DNS API request.

Useful evidence

• Collect server version.
• Collect raw serialized request.

Recovery and retry

Fix the source value or conversion and reject overflow before calling the DNS API.

Related errors

DNS_ERROR_DWORD_VALUE_TOO_SMALL checks the lower bound

Example

A negative timeout is cast to an unsigned DWORD and becomes a huge value. Type-safe range validation catches the conversion.

References

• Microsoft: exact Win32 system error range
• Microsoft: DNS server troubleshooting
• Microsoft: DNS logging and diagnostics