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Configure IIS DNS/Domains/access when usign VPN

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I have an Widows 2012 R2 server.
IT is always connected to a VPN
I run IIS for a couple of internal websites (These are not internet facing).
Most PCs on the network are permanently connected to a VPN.

Recently I found that we have DNS leaks. Where the PCs local adapter is configured with the VPN's DNS servers we hit a transparent DNS Proxy run by the ISP. To fix this we use the openVPN directive block-outside-dns

Unfortunately, this breaks access to the internal websites by name. Access by IP address works fine.

Without block-outside-dns using //server/home works
With block-outside-dns //server/home times out
With blokc-outside-dns //192.168.x.x/home works.

I'm hoping this is a IIS configuration issue.

Any suggestions?
Jan 4 '21 #1
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