IE7 Address not valid, “http:///”

While opening IE7 on the computer, it shows “Internet Explorer cannot display the webpage” even if there is a Internet connection. If someone try to access webpage by typing in URL like http://www.yahoo.com in the address bar it gives “The address is not valid” with “http:///” in the address bar. This is caused by proxy setting enabled to localhost (127.0.0.1). See figure below.

Solution: Disable the proxy setting or remove the localhost IP address.
Steps:
1. Click on Tools option and select Internet Options as shown below.

2. Click on Connection Tab and click on LAN settings as shown below.

3. Now uncheck Proxy server or remove the localhost IP 127.0.0.1 and the port number. Or simply uncheck the proxy server setting as shown below.

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About Winsock.

Winsock: In computing, the Windows Sockets API, which was later shortened to Winsock, is a technical specification that defines how Windows network software should access network services, especially TCP/IP. It defines a standard interface between a Windows TCP/IP client application (such as an FTP client or a web browser) and the underlying TCP/IP protocol stack. Source:wikipedia

Winsock settings(Repair/Reset): Most of the Internet connectivity problems arise out of corrupt Winsock settings. Windows sockets settings may get corrupted due to the installation of a networking software, or perhaps due to Malware infestation. You will be able connect to the Internet, but the packets won’t transfer back and forth. And errors such as Page cannot be displayed may occur when using Internet Explorer. This article lists the method to reset/repair the Winsock configuration to defaults.

Tools: “netsh winsock reset” command

This command resets the Winsock catalog to the default configuration. This can be useful if a malformed LSP is installed that results in loss of network connectivity. While use of this command can restore network connectivity, it should be used with care because any previously-installed LSPs will need to be re-installed.

netsh winsock show catalog

This command displays the list of Winsock LSPs that are installed on the computer.

To output the results to a file type this in Command Prompt (CMD.EXE)

Type, netsh winsock show catalog > C:\lsp.txt