80 port is occupied a resolution process example

Today a friend contacted me, said that the server site can not open, suspected is 80 port is occupied, but cannot find occupy program. Then the remote desktop on the server, the resolution process is as follows:

1, habitual first view the event log, nothing.

2, tasklist see if there are abnormal procedures, no exception found.

3, netstat view port, found that 80 did not use.

After these three aspects of the search, can only be attributed to the IIS itself, the preferred way to solve their own problems is to reinstall IIS, so open Add Delete program, an unexpected discovery, the computer installed a IIS7.5 Express, then the normal and Web site can not be visited to explain, Are Microsoft's iis,2 version of the conflict, so first uninstall the IIS7.5 Express, restart IIS, unresolved. Restart the server again, open the Web site is normal.

This is because IIS7.5 Express takes up 80, and because it is all IIS, event logs, task management, and no exceptions found in the port.