Does stopping an IIS7 application pool kill any currently executing requests? Or does it wait for all requests to complete?
Please notice, I am asking about stopping the pool, not recycling it.
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I have a .Net application hosted in IIS 10 running on Windows Service 2019. Sometimes the website stops responding (usually when running E2E tests). Even after restarting Website/Application Pool/IIS/Machine it doesn't work.
Looking in Event Viewer I see errors like these:
Forms authentication failed for the request. Reason: The ticket supplied has expired
Failed to stop a listening channel for protocol 'http' at allotted time from worker process serving application pool
A process serving application pool exceeded time limits during shut down
In HTTPERR files I see a lot of messages containing Connection_Abandoned_By_ReqQueue and Connection_Dropped
In inetpub log files I can't see any relevant, just the url requests.
To add more information, we have signalr installed and sometimes errors appear in the events, errors with messages like:
The user identity cannot change during an active SignalR connection.
Any idea what might be causing this?
I am facing an error in production due to IIS application pool shutdown during App-pool time out.
I want to reproduce the scenario in my local machine, however even if set low application pool time-out (5 minutes or 1 minute), it doesn't shutdown.
If I shutdown the application pool in the IIS user interface, it doesn't serve new requests. I want to simulate the scenario how it is shutdown and awake automatically when a new request comes in.
Thanks in advance,
Pandiarajan.
Instead of issuing a Stop command, use "Recycle". This will create a new instance of the AppPool and shutdown the old one.
We are using Kudu as a standalone installation, to manage all the IIS applications. But after the AppDomain or AppPool get recycled, all triggered jobs are rescheduled only after the next http request. The AppPool has been configured as "AlwaysRunning", and also "Preload" was enabled for the sites.
As possible workaround I can imagine, to fire an http request on AppDomain/Pool recycle, but how this can be achieved on IIS Configuration level, without modifying the Kudu sources?
Thank you.
We've implemented a "background service" in our Asp.Net web app that receives messages from MSMQ at random intervals without requiring an HTTP request to start up the application. We auto start this web app using a serviceAutoStartProvider.
Everyhing works when IIS initially starts up, the server is rebooted and so on, we receive messages just fine. BUT if we just stop the site in IIS (not touching the application or app pool), the application stops receiving MSMQ messages. And when we start the web site again, the serviceAutoStartProvider is not called again, so our app does not start listening to MSMQ messages again!
If we issue a HTTP request against the web app after the IIS site has been stopped and started again, it starts listening to MSMQ messages again.
Shouldn't our "background service" web app continue to listen to MSMQ messages even if the IIS site is stopped? It won't get any requests, but I think it should continue to run.
What exactly happens in an Asp.Net application/app pool when the IIS site is stopped? Any events fired that we can hook up to? The app pool claims to be "started" in IIS manager, but code is not running in it.
Why isn't our serviceAutoStartProvider called when the site is started again? I believe it is "by design", since the application isn't really stopped. But the applications isn't running, either, has to be waken up by an actual HTTP request.
When the IIS Web App shuts down (eg. due to no new HTTP(S) requests for the timeout time) the .NET app domain (within the app pool worker process) completely closes and unloads. This includes all background threads, including those used by the .NET thread pool.
A Web App can be configured with a longer (or no) timeout, then background worker threads could continue to process work.
But better would be to either run such workers in a specialist service process managed completely separately.
Or, even better, use IIS application hosting with WCF to create the MSMQ listener. I understand in this case the integration of Windows Process Activation Services with IIS would restart the Web App if a new message arrived after it had been shutdown.
I would host the MSMQ listenner in a windows service. Why couple it to IIS?
UPDATE
Actually what I mean is why couple the MSMQ and ASPNET in the same app pool?
You can now use "Application Initialization" feature of IIS8 (and IIS7.5), more information including version availability and usage documentation can be found at:
http://www.iis.net/learn/get-started/whats-new-in-iis-8/iis-80-application-initialization
This replaces "Application Warm-Up Module" which is no longer supported, and provides us with proper control over component/service initialization in an "always running" scenario.
I know that whenever you add/remove/modify any file in the "App_Code", "App_GlobalResources", and "bin" directories that ASP.NET will recompile and essentially restart the application.
My question is : "What happens to any threads currently executing durring the change?"
Do they finish? Is a Thread.Abort Exception thrown?
What happens if the application itself makes a change in any of those directories?
All currently executing threads are finished gracefully before recompilation.
Here's the docs:
When a worker process requests a
recycle, the WWW service initiates an
overlapped recycle, creating a new
worker process to replace the old one.
While the new worker process is
starting, the old process continues to
serve requests. After the new process
starts and initializes successfully,
the WWW service instructs the old
worker process to shut down. At this
point, the old worker process stops
accepting new requests from HTTP.sys
and begins to shut down. The WWW
service allows the old worker process
a configured time period in which to
finish processing its requests before
the worker process is shut down. The
WWW service terminates the worker
process if it fails to shut down
within the configured time.