There are some strange cases when a PC is connected to the internet but will only allow browsing on websites such as Google, Facebook, YouTube, or Wikipedia. This is often the result of updating one's operating system or computer settings. If this is the case, you need to check if your computer's LAN settings have been changed.
Verify Windows LAN Settings
Go to the Control Panel
> Internet Options
tab and then click on LAN settings
In the window that opens, clear the checkboxes next to Use a proxy server for your LAN
and Use automatic configuration script
. The Automatically detect settings
option is the only one that should remain enabled:
Click on OK
to save your settings. Open your web browser and try to connect to other websites. If the problem persists, then the only alternative left is to perform a system restore.