I have a server (Leopard Server, not my choice) running Apache and MySQL. Several months ago, the server began to raise "Forbidden" errors at random intervals, preventing access to a PHP application. This behavior randomly ceased.

Now, several days ago I installed Passenger and deployed a Sintra/Rack application. The application runs as a user acarneg (for example) from /Library/WebServer/Documents/presto/current/public, acarneg owns the entire structure. The _www user has access to the directory via ACL chmod +a "_www allow read,write,...".

Everything works great! But after a randomish interval, often ~12 or ~24 hours, Passenger throws an error that also prevents the PHP application from running. Passenger Error #2. Cannot stat file config.ru. Permission denied. But the permissions haven't changed (confirmed) and all one has to do to resolve the error is sudo apachectl graceful.

If the permissions aren't changing and Apache doesn't seem to have a legit problem, what is causing this mess? Why did it stop before, and why has it resumed!?!?!?

Thanks for the help!