Now the script runs properly and it is able to set the registry value. If I use Internet Explorer there are no issues i.e. the browser uses the correct proxy settings (as entered in the input dialog or 'no proxy' if cancelled) server. However when Firefox or Chrome are used (tried with different versions) when the browser behaves oddly.
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How to use proxy with Internet Explorer. Use Proxy with Internet Explorer - this article describes how to configure Internet Explorer to use a proxy server when making its connections. When Internet Explorer is using a proxy, all of the requests made by your browser will be sent to a proxy server instead who will fetch the requested resources on behalf of you and then forward it back to you. Add an Exception to Your Proxy Settings What is a Proxy? A Proxy Server is an intermediary that sits between a network and the outside internet. When you go to a web address in your browser, your request goes to the proxy server, which downloads the page, then sends it to your computer. Many networks do this because the proxy server acts as a safety buffer for web traffic. Configure Internet Explorer to Use a Proxy Server - Help Note: We are using Internet Explorer11 to demonstrate the changes, but these steps should be similar for all versions of Internet Explorer. Follow these instructions to configure Internet Explorer to use a Proxy Server: Click the Tools icon in the top right corner, then click on Internet options. Then click on the Connections Tab. How to use the Internet Explorer proxy settings | Smartproxy