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Disable Anonymous Proxy (Force Kerebos Proxy)

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We have a proxy server in place in our corporate environment, recently a major version upgrade to the proxy server has created some headaches.

Is there any way in windows, either via registry or GPO, to disable anonymous proxy server access and force it to use authentication every time?

I can see in my proxy server logs when a user requests a resource on the internet two things will happen, first an anonymous request comes in and gets blocked, then a duplicate request will come in as authenticated.

It looks like windows, by default, connects to proxy anonymously, when the proxy pushes back requiring authentication windows will reattempt via an authenticated request.

I would like to default all the machines in my network to skip the unauthenticated attempts and force windows to always send an authenticated attempt from the beginning.

Is this possible?

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