How to avoid “refused to connect” for public host names from inside a VPN?

I'm using a Windows server, that is behind a Nginx proxy within a VPN, as a development workstation. I am trying to connect to a Moodle server in the same subnet using either a public or private host name. I can ping the public host name, e.g. moodle.mydomain.com, but a browser fails to connect to that same public site name.

If I use a private host name, i.e. moodle.vpn3.mydomain.com, or a local IP Address, 192.168.1.175, a browser connects initially, but subsequent pages revert to using...

How to avoid “refused to connect” for public host names from inside a VPN?

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