I'm running Apache v2.2.21, PHP v5.38, and MySQL v5.5.16. The WAMP icon is green.
As the post title says, I can't access either localhost or phpMyAdmin from the WAMP systray icon menu, nor can I by typing http://127.0.0.1/index.php in a browser.
Clicking on either localhost or phpMyAdmin gives me the error message "Unable to connect - Firefox can't establish a connection to the server at 127.0.0.1."
I do have Skype and I know there are issues with Skype and WAMP port conflicts, so I quit Skype, and tried it, but got the same results.
At first the WAMP icon was always orange, but some searching here revealed that changing the listening port to 8080 (the default is 80) in httpd.conf. That got the orange icon to go green.