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There are situations where you can connect to your wireless network but will not be able to access Internet. This could be due to the following reasons:

1. DNS settings
2. Your Browser Settings.
3. Anti-virus / Firewall settings.
4. Rarely due to Virus/Trojan infection.



DNS settings: DNS (Domain Name System) is a service that translates domain names like yahoo.com to IP address. If one DNS server doesn’t know how to translate a particular domain name, it asks another one, and so on, until the correct IP address is returned. Usually for a home network, your DNS server IP address would be your gateway / router address or the main server IP address through which other systems connects to Internet. You can check the TCP/IP properties under Wireless Network properties to determine the current setting for DNS. This would be normally set to “Obtain DNS Server address automatically” unless specified by your Internet Service Provider or network administrator.

Browser Settings: For Wireless networks, make sure you run inetwiz from Start | Run and choose Connect using my Local area network (LAN) setting (Refer, article on creating a new broadband connection for additional help) . Additionaly, you can also check Tools | Internet Options | Connections tab | LAN settings to set to automatically detect proxy settings or specify any proxy IP address if used (for Internet Explorer only).

Firewall / Anti-virus settings: Check you firewall and anti-virus settings if they are not blocking ports used for your internet connection. Normally the default port 80 should be opened. You may also test your firewall settings by disabling it temporarily to see if you can access Internet.

Virus/ Trojan infection: Corrupted Windows XP files could cause your Internet connection not to work. Run anti-virus / anti-spyware like spybot/ adware to see if you can detect /remove/ clean any infected files.

Check the article on improving system performance for recommended links here.

Hope this helps. Please feel free to post your comments.