Configuring proxy server in Windows
Disabling the option to configure proxy settings is done through the computer's group policy.
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A proxy server accesses a website on behalf of a computer to protect the IP address and identity of the computer. A proxy server also caches previously accessed websites so that they would load faster the next time a computer tries to access them. Removing the proxy server may compromise the computer because it exposes its IP address and other Internet connection settings. To prevent users from changing the proxy configuration, a group policy can be enforced to disable the option.
1. Click the Windows "Start" button, type "gpedit.msc" in the Search field and press "Enter." This opens the Local Group Policy Editor window.
2. Expand the "Computer Configuration" section and expand the "Administrative Templates" section.
3. Expand the "Windows Components" section and select "Internet Explorer."
4. Right-click "Disable changing proxy settings" and click "Edit."
5. Select the "Enabled" radio button, click "Apply" and click "OK."
6. Close the Local Group Policy Editor window.
7. Click the Windows "Start" button, type "cmd" in the Search field and press "Enter" to open the command prompt window.
8. Type "gpupdate /force" (without the quotes) at the command prompt and press "Enter" to force a policy update on the computer. Close the command prompt window once the policy updates have completed successfully.