NetUnjoinDomain function (lmjoin.h)

The NetUnjoinDomain function unjoins a computer from a workgroup or a domain.


  [in] LPCWSTR lpServer,
  [in] LPCWSTR lpAccount,
  [in] LPCWSTR lpPassword,
  [in] DWORD   fUnjoinOptions


[in] lpServer

A pointer to a constant string that specifies the DNS or NetBIOS name of the computer on which the function is to execute. If this parameter is NULL, the local computer is used.

[in] lpAccount

A pointer to a constant string that specifies the account name to use when connecting to the domain controller. The string must specify either a domain NetBIOS name and user account (for example, REDMOND\user) or the user principal name (UPN) of the user in the form of an Internet-style login name (for example, ""). If this parameter is NULL, the caller's context is used.

[in] lpPassword

If the lpAccount parameter specifies an account name, this parameter must point to the password to use when connecting to the domain controller. Otherwise, this parameter must be NULL.

[in] fUnjoinOptions

Specifies the unjoin options. If this parameter is NETSETUP_ACCT_DELETE, the account is disabled when the unjoin occurs. Note that this option does not delete the account. Currently, there are no other unjoin options defined.

Return value

If the function succeeds, the return value is NERR_Success.

If the function fails, the return value can be one of the following error codes or one of the system error codes.

Return code Description
A parameter is incorrect.
The computer is not currently joined to a domain.
This computer is a domain controller and cannot be unjoined from a domain.


Unjoining (and joining) a computer to a domain or workgroup can be performed only by a member of the Administrators local group on the target computer. If you call the NetUnjoinDomain function remotely, you must supply credentials because you cannot delegate credentials under these circumstances.

Different processes, or different threads of the same process, should not call the NetUnjoinDomain function at the same time. This situation can leave the computer in an inconsistent state.

A system reboot is required after calling the NetRenameMachineInDomain function for the operation to complete.


Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header lmjoin.h (include Lm.h)
Library Netapi32.lib
DLL Netapi32.dll

See also



Network Management Functions

Network Management Overview