Continuously in errorlog.txt show up error message validating users. Like this:
22/04/2010 14:22:55: RAI\mikel.diaz Error de inicio de sesión: nombre de usuario desconocido o contraseña incorrecta.
en System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
en System.DirectoryServices.DirectoryEntry.Bind()
en System.DirectoryServices.DirectoryEntry.get_AdsObject()
en System.DirectoryServices.DirectorySearcher.FindAll(Boolean findMoreThanOne)
en System.DirectoryServices.DirectorySearcher.FindOne()
en LansweeperService.LS_ActiveDirectory.UserExistsInAD(String username, String userdomain, Hashtable& DomainsNotAvailableList)
Translated:
22/04/2010 14:22:55: RAI\mikel.diaz logon error: user name unknown or bad password.