Iis – How to prevent IIS 8 from stopping idle ASP.NET applications

Have you found any solution to this? I'm reguarly seeing the same thing for quite a while now where static content such as JS, PNG and GIFs are stuck in the "SendResponse" state in the "IIS Web Core" module. I'm in the same situation with IIS 7/ASP.NET 4.0. I'm monitoring these with this Microsoft.Web.Administration code, rather than appcmd.

UPDATE: On some further research, one possibility I've come up with is that it may be a dropped network connection. In this thread, the person reports Win32 status codes of 1236 in his IIS logs, which is "The network connection was aborted by the local system.". I'm not sure however if this means the requester cancelled the request, or the web server has aborted the request. Conceivably the requester might navigate to another page on your site before all these HTTP requests for page content (images, JS, etc) have completed which would probably abort all the pending requests to the web server (i.e. he clicks on a link on the page when it first renders). I've found some 1236 Win32 status codes in my IIS logs (mostly for static content such as GIF, PNG and JS with a few of them tied to ASPX pages), however, I'm not sure if these are the same requests I'm seeing stuck in the "SendResponse" state.

If an external host has periods where it cannot establish a TCP connection or the connection times out, then your issue is perhaps network-related, rather than application-related. IIS wouldn't log anything, because it's oblivious to any external network issues - it just services requests it receives.

If you're monitoring service is also showing that ping tests are timing out, this would indicate a definite network connectivity problem. You need to start troubleshooting that.