Setup : Windows XP with the following servers installed Apache 2.2 installed and running IIS 5.1 Installed and running Problem : Whenever I add the following directive to the Apache configuration to enable ssl: Listen 443 and try to restart Apache, I get the following error: (OS 10048)Only one usage of each socket address (protocol/network address/port) is normally permitted. : make_sock: could not bind to address 0.0.0.0:443 My solution : 1. Stop the IIS server 2. Change the Apache configuration 3. Start Apache http server 4. Start IIS server Good luck!