Internet Explorer Uses Proxy Server for Local IP Address Even if the Bypass Proxy Server for Local Addresses Option Is Turned On

Important

The Internet Explorer 11 desktop application will be retired and go out of support on June 15, 2022 (for a list of what's in scope, see the FAQ). The same IE11 apps and sites you use today can open in Microsoft Edge with Internet Explorer mode. Learn more here.

This article helps you resolve the problem that occurs when you connect to a Web server using the Internet Protocol (IP) address or Fully Qualified Domain Name (FQDN) on the local network.

Applies to:   Windows 7 Enterprise, Windows 7 Enterprise N, Windows 7 Home Basic, Windows 7 Home Premium, Windows 7 Professional, Windows 7 Professional N, Windows 7 Starter, Windows 7 Starter N, Windows 7 Ultimate, Windows 7 Ultimate N, Microsoft Windows Server 2003 Standard Edition (32-bit x86), Internet Explorer
Original KB number:   262981

Symptoms

When you connect to a Web server using the Internet Protocol (IP) address or Fully Qualified Domain Name (FQDN) on the local network, Microsoft Internet Explorer or Windows Internet Explorer connects through an assigned proxy server even if the Bypass proxy server for local addresses option is turned on.

However, if you connect to a Web server using the host name (for example, http://webserver) instead of the IP address (for example, http://10.0.0.1) or FQDN (for example, http://webserver.domainname.com), the proxy server is bypassed and Internet Explorer connects directly to the server.

Cause

By default, only host names are checked when the Bypass proxy server for local addresses option is turned on.

Resolution

To bypass a range of IP addresses or a specific domain name, specify the addresses in the proxy exception list:

  1. In Internet Explorer, on the Tools menu, select Internet Options.
  2. On the Connections tab, select LAN Settings.
  3. Select Advanced, and type the appropriate information in the Exceptions area.

Status

This behavior is by design.