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Glen Starrett wrote: > LSA is the MS app that handles the authentication, I believe for NTLM > level security, but it might apply to more advanced levels as well. Try > looking to see if the LSA service is running on the users machine when > there is and is not having a problem to see if there's a correlation. If > there is, then try to figure out which app is crashing it. If LSA stops, then the system shuts down (rather dramatically.. it gives you a countdown). Try killing lsass.exe sometime :) The error usually has something to do with the network in my experience, although the only time I've ever had it myself I fixed it with an OS reinstall (life's too short when you can't track it down). Tony