[monit] Monit HTTP proxy via Apache: (13)Permission denied: proxy

[Simon Blandford]

I have set up monit http as follows...

set httpd port 2812 and
    allow localhost       # allow localhost to connect to the server

I have set up Apache as follows...

ProxyVia On
ProxyRequests Off

ProxyPass /monit http://localhost:2812
ProxyPassReverse /monit http://localhost:2812

I can access Monit fine if I access it from localhost:2812 using a web 
browser on the same machine. However if I try to access it via 
http://localhost/monit I get the a 503 Service Unavailable message with 
the following Apache error log entry:  "(13)Permission denied: proxy: 
HTTP: attempt to connect to 127.0.0.1:2812 (localhost) failed".

I am using CentOS 5.3, httpd-2.2.3-22.el5.centos.2 and monit-5.0-1.el5.rf.