We are running Apache 2.2.3 with proxy and caching on Windows Server 2003. It is proxying to an external site. When the external site is access directly we do not get 503 HTTP Response Codes, however when we access the site through the proxy it does throw 503 responses periodically. When Apache Proxy throws a 503 response it also generates the following message in the error.log:
[Wed Apr 04 17:55:41 2007] [error] (OS 10060)A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. : proxy: HTTPS
: attempt to connect to xxx.xxx.xxx.xxx:443 (*) failed
Any help would be greatly appreciated!