ldap_simple_bind_s function (winldap.h)

The ldap_simple_bind_s function synchronously authenticates a client to a server, using a plaintext password.

Caution  This function sends the name and password without encrypting them, and an unauthorized user, on the network, could read the password. Unless a TLS (SSL) encrypted session has been established, do not this function. For more information about how to set up an encrypted session, see Initializing a Session.


WINLDAPAPI ULONG LDAPAPI ldap_simple_bind_s(
  [in] LDAP       *ld,
  [in] const PSTR dn,
  [in] const PSTR passwd


[in] ld

The session handle.

[in] dn

The name of the user to bind as. The bind operation uses the dn and passwd parameters to authenticate the user.

[in] passwd

The password of the user specified in the dn parameter.

Return value

If the function succeeds, the return value is LDAP_SUCCESS.

If the function fails, it returns an error code. For more information, see Return Values.


The ldap_simple_bind_s function initiates a simple synchronous bind operation to authenticate a client to an LDAP server. Subsequent bind calls can be used to reauthenticate using the same connection.

Upon completion of the bind operation, ldap_simple_bind_s returns to the caller. Use ldap_simple_bind if you prefer to have the operation carried out asynchronously. Be aware that if an LDAP 2 server is contacted, do not attempt other operations over the connection until the bind call has completed successfully.

Multithreading: Bind calls are unsafe because they apply to the connection as a whole. Use caution if threads share connections, and try to thread binds with other operations.

Note  The Microsoft LDAP client uses a default timeout value of 120 seconds (2 minutes) for each bind-response roundtrip. This timeout value can be changed using the LDAP_OPT_TIMELIMIT session option. Other operations do not have a timeout unless specified using ldap_set_option.
When all of the operations on the session handle are completed, terminate the session by passing the LDAP session handle to the ldap_unbind function. Also, if the ldap_simple_bind_s call fails, the session handle should be freed with a call to ldap_unbind when no longer required for error recovery.


Minimum supported client Windows Vista
Minimum supported server Windows Server 2008
Target Platform Windows
Header winldap.h
Library Wldap32.lib
DLL Wldap32.dll

See also

Establishing an LDAP Session


Return Values