I work in a school district and we frequently goto a websites hosted locally at our DA site. Even though the websites have a 10.* IP, I have to constantly clear the cache off our DNS server and run ipconfig /flushdns, then ipconfig /flushdns OR restart the client computer before I can successfully log into the website. I can log in if I type the IP address but not through the URL. Why is this happening? Other schools do not have an issue logging into this local website. So I am 100% sure this is a problem on our DNS server or maybe even a route statement in our router.