Our network has been running fine for a long time but the last two nights we lost connectivity breifly to our file server which is just window 2003 storage server and then last night we lost connectivty to our DC which is Windows 2000 server and runs exchange / DNS services. Two days ago I scavange for stale records and cleared the DNS cache. That the only think I did before this happened. Could this be affecting our connectivity at night. As soon as we reboot our DC it is fine though. I need to get this corrected. I run DHCP and all the internal clients use the DC for DNS. The DNS server is configured for forwarders to our ISP. Am I correct when looking at DNS or could it be something else?