paul.luminos.nl

I was puzzled why Apache 2.2 returned the following error upon installation:

Installing the Apache2.2 service
The Apache2.2 service is successfully installed.
Testing httpd.conf....
Errors reported here must be corrected before the service can be started.
(OS 10048)Only one usage of each socket address (protocol/network address/port)
is normally permitted.  : make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs

You can check if the port is indeed in use by opening a command prompt and typing:

netstat -na

If you can find a row containing port 80, then it is in use. For instance:

Proto  Local Address          Foreign Address        State
TCP    0.0.0.0:80             0.0.0.0:0              LISTENING

If you're having difficulties discovering which application is using the port, run the command prompt as administrator and enter the following command, which will report the executable file that is responsible:

netstat -nab

In my case, it turned out to be Skype. Check that your Skype settings aren't blocking the port and close Skype. Restart the Apache service and everything should be working.