I am running Windows 2003 Small Business Server (R2), with 5 clients. If I leave the client PC's on overnight, they lose connection with the server. I get the message "The system has detected a possible attempt to comprimise secuirty" If I log off then back on, I'm ok. It also seems to take a long time to log into Windows XP Pro. It hangs up on Applying Personal Settings. I have read other answers in this forum and have tried everything people suggested. I made sure the NIC card power saving is off, I tried both manual IP addresses and using DHCP. I checked my DNS settings. They seem to be fine. Any other idieas?