Web Server : IIS 7.5
Application Server : ColdFusion 10 update level 10
Running under 1 instacne : cfusion (say)
Number of sites = 4
2 of the smaller sites stop responding http requests and rest of the 2 are working fine.
I believe this is the scenario here. Please correct, if I am wrong?
All 4 sites have .cfm or only 2 of them which are not working?
Have you configured connector with All or individual for all sites?
On those 2 sites, if you have .cfm and .html, is the issue only with .cfm?
Is the issue specific to some .cfm applications?
There are various ways to check the behavior of requests on those 2 sites.
Verbose Logging, You can use charles proxy which will let you know that is CodlFusion is the root cause for not serving those requests
NOTE : Above 2 methods strictly during maintenance.
If the traffic is too high on those 2 sites, check the tuning article : http://blogs.coldfusion.com/post.cfm/tuning-coldfusion-10-iis-connector-configuration
All 4 sites are running .cfm pages
Connector is configured with individual sites.
The issue appears to be .cfm although I have not tested the .html pages that are associated to the sites. The Index page is .cfm I will test html acces when the site goes down again.
The 2 sites which stop responding are very small and composed of static .cfm pages "Not very complex".
The smaller sites thaty drop out usually generate 2 to 4 MB of log traffic a day.
The other 2 sites are the heavy hitters with one generating around 200 to 300 MB log files a day and the other 20 to 30 MB a day. These 2 heavy sites never drop out.
Ok the site just went down and I have confirmed that html and .cfm, all stop working for the 2 smaller sites.
Are you running individual app pool for every website?
Add a new site under IIS with it's own app pool. Add .html pages only and test the behaviour. If everything works fine, then create connector for this new website and add the behaviour with both .html and .cfm.
If you encounter the same issue, make sure you collect the logs. If possible, collect the verbose logs : http://helpx.adobe.com/coldfusion/kb/enable-verbose-logging-coldfusion-10.html
NOTE : Test the above strictly during maintenance window so that production will not be affected at all.