Internet can get disconnected due to number of reasons. Corrupt winsock settings is very common cause of internet connection not working. Other application (malicious) software at times change winsock settings that results in no live internet connection. Manual winsock settings repair
See Winsock activity details with Socket Sniff
[For Advance users] Winsock activity is important to remain connected. SocketSniff is a small utility that gives large details of Winsock (Windows Sockets) activity on your computer. In an easy to understand manner, it shows lot of related information. This small utlity does not