ColdFusion randomly stops rendering

So, this is an issue we've been dealing with indefinitely. CF10 on a Win2008 environment just stops working. I remote into the server, the ColdFusion services are using 0% CPU, usually eating about 600-850MB of memory, and no pages are being delivered. Simply a white page. Browser (Chrome 30) times out eventually reporting an 'ERR_UNEXPECTED' error.
Restarting World Wide Web Service has no effect. Restarting IIS sites/server (nodes) has no effect. ONLY restarting the ColdFusion Application Server service results in services getting restored. And it takes normal amount of time to STOP the service, but starting it up takes a long time (though it eventually starts, and ColdFusion is rendered again)
I don't have troubleshooting skills necessary to know what log files to watch or a background in networking know-how, but I'd really love to start taking steps to finding out what the heck is doing this. So if you guys can suggest any steps, I'll gladly take them. The last time this happened for us was around 10:00AM-10:30AM on January 9, 2014 EST.

Hi
Test the below steps during development
Go to C:\ColdFusion10\cfusion\runtime\conf and take a back up of server.xml. Open server.xml and enable the built in port : 8500 like this

<Connector executor="tomcatThreadPool" maxThreads="50"
port="8500" protocol="org.apache.coyote.http11.Http11Protocol"
connectionTimeout="20000"
redirectPort="8445" />

Restart CF 10 service and then place few test cfm files in CF 10 root (C:\ColdFusion10\cfusion\wwwroot)
Open URL : http://localhost:8500/a.cfm and observe that CF is rendering the pages or not. If yes, then CF 10 is working fine.
Now you need to test when a request is coming to webserver, is your webserver forwarding the request to CF 10 or not. You can create a new test website in your webserver and configure that website with CF 10. Place few .cfm files and then observe the behavior. While you launch the webserver connector tool to add this test website, click on Advanced and check "Enable Verbose logging for connector"
NOTE: Enabling verbose is not all recommended in production environment.
This way you will be able to capture logs and troubleshoot accordingly. You can also check the Failed Request Tracing logs of IIS to find the root cause of this issue.
If you still encounter the issue, you can share the stack trace here.
Also, if this is a dev environment and you think that you have messed up some settings without backup then go ahead and give a shot to reinstall CF 10
HTH
Thanks
VJ

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