I have a user (XP Pro SP2)whose account keeps getting locked out with Event ID 40960. The source is LSASRV and category is SPNEGO negotiator. The AD environment is mixed, i.e. W2K3 and W2K. The event ID mentions that too many invalid attempts to login or change a password were made against our application server (standalone server). User changed her password recently ok and this may be key to the solution. The application server is running IIS and ERP software but authentication is domain name user and password reliant. I unlock the account (or it will unlock itself after 30 minutes) but the same thing can happen again maybe later on.