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Problems connecting to internal server

Mwvarner asked
Last Modified: 2016-03-09
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.
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