I don't think that is necessary---

In order to do this you are going to have to forward incoming traffic on your router.... you could control it there with some fancy tricks.

Instead, I would change the port of the webserver to something besides port 8088. This will prevent most automated scanning.

You can't enable a password out of the box.

I have not tried it, but this should work:

Use nginx (http://nginx.org/en/download.html) as a reverse proxy on your vMix computer. There is also a Windows version for download.

You can use this guide:
http://www.robustpercept...o-prometheus-with-nginx/

For generating the htpassword-file use this link:
http://www.htaccesstools.com/htpasswd-generator/

To start nginx as a service:
http://oss-world.blogspo...ndows-service-using.html

As last step you have to add a firewall rule on your local windows firewall which blocks incoming traffic except localhost/127.0.0.1 on port 8088 (default vMix port) to your vMix computer.

Now it's not possible anymore to access the vMix web interface directly, only through the reverse proxy.

Regards