Turns off Windows Network Isolation's automatic proxy discovery in the domain corporate environment. If you enable this policy setting, it turns off Windows Network Isolation's automatic proxy discovery in the domain corporate environment. Only proxies configured with Group Policy are authoritative. This applies to both Internet and intranet proxies. If you disable or do not configure this policy setting, Windows Network Isolation attempts to automatically discover your proxy server addresses. Fix: (1) GPO: Computer Configuration\Administrative Templates\Network\Network Isolation!Proxy definitions are authoritative (2) REG: HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\NetworkIsolation!DProxiesAuthoritive