Knowledge

ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN - 8569 (0x2179)

The forest functional level cannot be raised to the requested value since one or more domains are still in mixed domain mode. All domains in the forest must be in native mode, for you to raise the forest functional level.

Updated: Feb 21, 2026

Technical Background

The error code ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN (8569, 0x2179) is a specific technical issue encountered when attempting to raise the forest functional level in an Active Directory environment. This error indicates that one or more domains within the forest are still operating in mixed domain mode, which prevents the overall forest from transitioning to a higher functional level.

Error Details

This error arises due to the requirement for all domains within a forest to be in native mode before the forest can be upgraded to a newer functional level. Mixed domain mode refers to a transitional state where some domains are still using older schema and functional levels, while others have been upgraded. This inconsistency prevents the forest from achieving a uniform higher-level configuration.

Common Causes

  • Inconsistent Domain Modes: One or more domains within the forest are in mixed domain mode, preventing the entire forest from being upgraded to a newer functional level.
  • Incorrect Configuration: The configuration of one or more domains may not support the desired forest functional level due to schema or other compatibility issues.

Real-World Context

This error is particularly relevant when managing large Active Directory forests where multiple domain controllers and domains are involved. Ensuring all components are in sync and compatible is crucial for maintaining a stable and secure environment.

Is This Error Critical?

The criticality of this error depends on the specific requirements of your organization's Active Directory infrastructure. If upgrading to a newer forest functional level is necessary, resolving this issue is essential to ensure proper functionality and security.

How to Diagnose

To diagnose this issue, follow these steps:

  1. Review Domain Modes: Use tools like dsmod or the Active Directory Users and Computers snap-in in the Microsoft Management Console (MMC) to check the current domain modes.
  2. Verify Schema Compatibility: Ensure that all domains are using compatible schema versions. Inconsistencies can prevent the forest from upgrading.
  3. Check Configuration Settings: Review any custom configuration settings or policies that might be affecting the domain's ability to transition to a higher functional level.

How to Resolve

To resolve this issue, take the following actions:

  1. Upgrade Mixed Domain Modes: Ensure all domains are in native mode by performing necessary schema and functional level upgrades.
  2. Consolidate Configuration: Standardize configuration settings across all domains to ensure consistency.
  3. Reconfigure as Needed: Adjust any domain-specific configurations that may be preventing the upgrade.

Developer Notes

When encountering this error, developers should focus on ensuring that all components of the Active Directory forest are in a compatible state before attempting to raise the forest functional level. This includes verifying schema versions and configuration settings across all domains.

Related Errors

  • ERROR_DS_DOMAIN_FUNCTIONAL_LEVEL_VIOLATION (8567): Indicates issues with domain functional levels.
  • ERROR_DS_FOREST_FUNCTIONAL_LEVEL_VIOLATION (8568): Indicates issues with forest functional levels.

FAQ

Q: What does the error code 8569 mean?

A: The error code 8569, ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN, indicates that one or more domains within a forest are in mixed domain mode and cannot be upgraded to a higher functional level.

Q: How can I resolve this issue?

A: Ensure all domains are in native mode by performing necessary schema and functional level upgrades, and standardize configuration settings across the forest.

Summary

The ERROR_DS_NO_BEHAVIOR_VERSION_IN_MIXEDDOMAIN error is a specific technical issue encountered when attempting to raise the forest functional level in an Active Directory environment. Ensuring all domains are in native mode and configurations are consistent is crucial for resolving this issue and maintaining a stable, secure Active Directory infrastructure.