Couple possibilities come to mind... DNS not resolving 'cuz you are querying upstream DNS before internal... Users > Resource Policies > select NC role and check if "Search the device's DNS servers first, then client" selected. You home network range is over-writing your intranet. ipconfig /all, netstat -rn, and the IP of the internal server should yield some clues. Of course there's a lot of other potentials like restrictions from source IP, access to apps, etc. but the above two are the usual errors.
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