OS X Snow Leopard server, proxy server stopped working.

Hi All,
I have OS X Snow Leopard Server (10.6.8) configured as a forward proxy server. It was working fine for a year until today. I cannot access any external web sites and get the following error:
Service Unavailable!
The server is temporary unable to service your request due to maintenance downtime or capacity problems. Please try again later.
If you think this is a server error, please contact the webmaster.
Error 503
www.apple.com
Sun Jul 27 22:53:18 2014
Apache/2.2.24 (Unix) mod_ssl/2.2.24 OpenSSL/0.9.8y
If I change the proxy configuration on the Mac client (MacBook Air) to access the Internet directly (bypass the proxy server) all websites work fine. In the Server Admin, Web, logs I see the following errors:
Access /var/log/apache2/access_log.
"GET http://www.apple.com/startpage/HTTP/1.1" 503 1062
Error /var/log/apache2/error_log.
[error](60)Operation timed out: proxy:HTTP:attempt to connect to 2.16.236.183:80(*) failed.
I have tried the following but made no difference:
-Stop/Start the Web Server.
-Restarted the Server completely.
-Uninstalled/Reinstalled the Web Server (Off/On).
-Reconfigured the forward proxy settings.
-Empty the proxy cache folder.
-Checked the files exist under /etc/apache2 folder.
-Checked the files exist under /var/log/apache2 folder.
-Checked the the proxy_module and ssl_module are enabled.
Any ideas and how to troubleshoot this issue further is most appreciated.
Thanks in advance.

I think I have fixed it. I have reloaded/restarted the Cisco router/firewall back end and front end now proxy is working again. Very odd since I use the same devices to connect directly to the Internet without the proxy server. Oh well, it's working again so it's all good.

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OS X Snow Leopard server, proxy server stopped working.

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