On initial installation all users were able to login properly. Over time
increasing numbers of users unable to login. Error on NMM agent 'SPL
Login failed [0XAE0B] (user) -DDC: Error writing to the directory'.
Environment: NW51sp7; GW agents 6.5.1; Messenger 1.0.2; Messenger using
direct access running on server with directory master. NM agent access
via admin userid & password. diruserauthbind=no;