You can fix DNS look-up issues in Windows 7 and Vista by changing the configured DNS servers.
DNS (Domain Name System) is a system of servers that support a hierarchical database used by networked computers to find the IP address of a network host, such as a Web site, when given the domain name of the host. If a Web browser fails to connect to websites frequently, the issue could be caused by a DNS server connection failure, or a failure of the DNS server to resolve the IP address of the website when provided with the domain name. Change the DNS look-up server in order to fix website connectivity issues.
Instructions
1. Click the "Start" or "Globe" button in the lower left corner of the PC desktop, and then click the "Search" box. Type "ncpa.cpl" in the "Search" box, and press the "Enter" key. The "Network Connections" window will appear.
2. Right-click the icon of the network connection used to connect to the local network and the Internet, and then click "Properties" in the menu that appears. Select "Yes" if a "User Access Control" window appears in order to confirm that you wish to open the network connection "Properties." The "Local Area Connection Properties" window will appear.
3. Select the "Internet Protocol Version 4 (TCP/Ipv4)" item in the protocol list displayed, and then click "Properties." Select the "Use the following DNS server addresses" radio button. Type the IP address of the alternate DNS server into the "Preferred DNS server" field. Type the IP address of a second DNS server into the "Alternate DNS server" field.
4. Click the "OK" button, and then click the "OK" button in the "Local Area Connection Properties" window to save the settings and change the DNS servers used for DNS look-up.
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