already read the man page, and tried all both basic and ntlm. It still gives a 404 Not Found, if you have http://our.external.server
and 403 Forbidden if you just use the ip with no http.
I think you are out of luck, probably your proxy does not allow you to
connect to the openvpn port. Try to run the server on 443 or redirect
port 443 to the openvpn port.
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