I have what I believe is a DNS problem. I have an internal web server that my users access on a on regular basis. Lately some of them can't connect to the server. They get "Page Cannot be displayed. However if I have them connect to the network via a VPN connect they can connect to the server fine.
I can also get it to connect sometimes by switching from a wired connection to our Wi-Fi or from Wi-Fi to a wired connection.
I'm fairly sure it has something to do with DNS but I'm not sure where to start to try to find the issue.