问题
I have installed wamp on a virtual server, and everything seems fine (i.e. the server is running and I'm seeing the color green).
What seems to be going on is that when I try to run a web site (for example /localhost/sitename), I'm getting a 503 Service Unavailable, Service temporarily unavailable. Please try again soon. Despite that everything is running, no apache errors and so on. What would cause the 503 error to show?
来源：https://stackoverflow.com/questions/21125047/im-getting-a-service-unavailable-on-wamp-but-everything-is-running