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Viewing and editing web proxy settings

On Windows there are four different modes that the proxy settings can be in:

1. No proxy at all
2. Proxy automatically detected from local network (WPAD)
3. Proxy configured using a script (PAC)
4. Proxy explicitly set using a proxy server name/address and port number

To alter/check:

1. Open up the Internet Options Control Panel. You can find this by doing one of the following:
   • Selecting Control Panel from your Start Menu (Windows XP to Windows 7/Server 2008R2)
   • Right-clicking on the Start Menu and choosing Control Panel (Windows 8.1/Server 2012R2)
   • Clicking on the start menu and typing Internet options (Windows 10)
   • Clicking on the start menu and typing Control panel and then picking Network and Internet and Internet Options (Windows 10)
2. The Internet Options Control Panel will look like this (titled Internet Properties):
   
3. Click on the Connections tab at the top of the window:
   
4. Click on the LAN settings button towards the bottom of the window. This will open up a new window titled Local Area Network (LAN) Settings. The current proxy server address and port can be seen in the proxy server section towards the bottom:
   
5. The use of a proxy server can be switched on and off with the Use a proxy server for your LAN [...] check box. If the box is unticked, the proxy address and port will be greyed out. If you definitely don't want to use a proxy at all, make sure that Automatically detect settings is unticked:
   
6. Instead of specifying a proxy server by name or IP address, you may need to provide a Proxy Auto-Configuration (PAC) script. To do this, tick Use automatic configuration script and enter the PAC address. Untick all the other boxes:
   
7. The default settings have no explicit proxy set, but have Automatically detect settings enabled. This will attempt to download a Proxy Auto-Configuration (PAC) script from http://wpad/wpad.dat. If the wpad.dat file cannot be downloaded, no proxy will be used:
   
8. To close the windows, click OK on the Local Area Network (LAN) Settings window and then OK on the Internet Properties window.

If using a NetManager as a proxy, you can configure WPAD and PAC files to use your choice of proxy ports for different levels of filtering.