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View and set the functional level manually

The Lightweight Directory Access Protocol (LDAP) tools such as Ldp.exe and Adsiedit.msc can be used to view and to modify the current domain and forest functional level settings. When you change the functional level attributes manually, the best practice is to make attribute changes on the Flexible Single Master Operations (FSMO) domain controller that is normally targeted by the Microsoft administrative tools.Domain functional level settings

The msDS-Behavior-Version attribute is on the naming context (NC) head for the domain, i.e., DC=corp, DC=contoso, DC=com.

The following are the values that can be set for this attribute:
  • Value of 0 or not set=mixed level domain
  • Value of 1=Windows Server 2003 domain level
  • Value of 2=Windows Server 2003 domain level
  • Value of 3=Windows Server 2008 domain level
  • Value of 4=Windows Server 2008 R2 domain level

Mixed mode and native mode settings

The ntMixedDomain attribute is on the naming context (NC) head for the domain, i.e., DC=corp, DC=contoso, DC=com.

The following are the values that can be set for this attribute:
  • Value of 0=Native level domain
  • Value of 1=Mixed level domain

Forest level setting

The msDS-Behavior-Version attribute is on the CN=Partitions object in the Configuration naming context (NC), i.e., CN=Partitions, CN=Configuration, DC=ForestRootDomain.

The following are the values that can be set for this attribute:
  • Value of 0 or not set=mixed level forest
  • Value of 1=Windows Server 2003 interim forest level
  • Value of 2=Windows Server 2003 forest level

    Note When you increase the msDS-Behavior-Version attribute from the 0 value to the 1 value by usingAdsiedit.msc, you receive the following error message:Illegal modify operation. Some aspect of the modification is not permitted.


  • Value of 3=Windows Server 2008 domain level
  • Value of 4=Windows Server 2008 R2 domain level

After you use the Lightweight Directory Access Protocol (LDAP) tools to edit the functional level, click OK to continue. The attributes on the partitions container and on the domain head are correctly increased. If an error message is report by the Ldp.exe file, you can safely ignore the error message. To verify that the level increase was successful, refresh the attribute list, and then check the current setting. This error message may also occur after you have performed the level increase on the authoritative FSMO if the change has not yet replicated to the local domain controller.