I have a client which has a problem I can not figure out. He uses Win2K Advanced server and Win XP and Win 2000 for his workstations. When he boots up the server all connectivity works fine and has no problems for about an hour or so. Then he starts seeing huge delays connecting to the server. Sometimes1-10 minutes to view shared folders and files. he had the network on DHCP and after the hour the workstations could not connect at all. We changed the DHCP to static IPs and now it works alittle better but still problematic. When the networking is delayed he can still ping the server and all other computers and if you restart the workstations everything will work another hour or so. I am leaninf towards DNS issues. His server has DNS errors and other ones. They are event id 4126 every 30 minutes or so and event id 4000 every 30 minutes or so. Anybody have a clue or have they seen this before?