[Tue Jun 03 22:05:51 2014] [error] (110)Connection timed out: proxy: HTTP: attempt to connect to 127.0.0.1:3000 (127.0.0.1) failed [Tue Jun 03 22:05:51 2014] [error] ap_proxy_connect_backend disabling worker for (127.0.0.1) [Tue Jun 03 22:05:52 2014] [error] proxy: HTTP: disabled connection for (127.0.0.1) [...]
The problem is that the Apache proxy module, recognising that the service was unavailable, stopped redirecting requests to it for one minute.
The problem was solved adding a retry=0 parameter to the ProxyPass directive.
Adjust the following lines in your vhost then restart Apache
ProxyPass / http://127.0.0.1:3000/ retry=0 timeout=5