I've seen other posts but the fixes have not worked. We started with 1 xp client that would loose the trust with the server when accessing shares and a reboot would fix it. Seems like it happens overnight which it does, sometime between 6-7 each night something happens and trust is broken. A reboot fixes the problem. Now multiple machines have this problem. We are now having this problem on two seperate networks with mutiple clients both using SBS 2003 server. Removing from domain and readding as suggested doesn't fix the problem. Another solution was to remove from domain and clean out dns suffix information and that hasn't worked. We have installed all critical/security updates/patches for the clients and servers and still are getting no where. This has been happening for over two months and today another client caught the problem. Where do I start looking now?