DNS_ERROR_INVALID_POLICY_TABLE - 9572 (0x2564)
Name resolution policy table has been corrupted. DNS resolution will fail until it is fixed. Contact your network administrator.
Updated: Feb 21, 2026
Technical Background
The DNS_ERROR_INVALID_POLICY_TABLE error code, with the numeric value of 9572 and the hexadecimal representation 0x2564, is a specific diagnostic error that indicates an issue with the name resolution policy table. This table contains rules for how DNS queries are processed on a Windows system, including which servers to query first or fallback options.
Error Details
This error typically occurs when the name resolution policy table has been corrupted or altered in a manner inconsistent with its expected format or content. The corruption can be due to various factors such as manual edits, software conflicts, or hardware issues that affect storage integrity.
Common Causes
- Corrupted Data: The policy table may have been modified incorrectly, leading to invalid entries or structures.
- Incorrect Usage Context: Misuse of the name resolution policy table by applications or administrators can result in corruption.
- Hardware Issues: Storage media failure or data corruption due to hardware malfunctions could lead to this error.
Real-World Context
Administrators and developers should be aware that this error can impact network connectivity, as DNS queries may fail if the policy table is not correctly configured. This can result in intermittent or complete loss of internet access for users on the affected system.
Is This Error Critical?
The criticality of this error depends on the importance of name resolution services within the network environment. In mission-critical applications, such as web browsing or remote server access, this error could be highly disruptive.
How to Diagnose
To diagnose the issue, administrators should follow these steps:
- Review Operation Context: Check if there have been any recent changes to the name resolution policy table or related configurations.
- Validate Parameters: Ensure that all parameters used in the policy table are correct and adhere to expected formats.
- Confirm Object Types: Verify that the entries in the policy table are of the correct type (e.g., DNS server, domain, etc.) and do not contain invalid data.
How to Resolve
To resolve this issue, administrators should take the following actions:
- Restore Data: If possible, restore the name resolution policy table from a backup or previous known good state.
- Correct Parameter Usage: Ensure that all parameters are correctly formatted and valid.
- Retry Operation with Valid Inputs: After correcting any issues, attempt to resolve DNS queries again.
Developer Notes
Developers should be cautious when modifying the name resolution policy table programmatically. Always validate input data and ensure that operations adhere to expected formats and constraints to prevent corruption.
Related Errors
DNS_ERROR_NO_REVERSED_NAME_RECORD(9571, 0x2563): Indicates a failure in resolving reverse DNS queries.ERROR_INVALID_PARAMETER(87, 0x57): A generic error indicating that one or more parameters are invalid.
FAQ
Q: What causes the DNS_ERROR_INVALID_POLICY_TABLE error?
A: This error can be caused by corrupted data, incorrect usage context, or hardware issues affecting storage integrity.
Q: How do I prevent this error from occurring?
A: Regularly back up the name resolution policy table and ensure that all modifications are made with caution to avoid introducing invalid entries.
Summary
The DNS_ERROR_INVALID_POLICY_TABLE error code indicates a corrupted name resolution policy table. Administrators should take steps to restore or correct the table, while developers should validate parameters and handle operations carefully to prevent such issues.