We have Windows 2003 Server IIS 6.0 and Windows 2008 Server IIS 7.0
Issue : In IIS 6.0, when Default App pool crashes it shut down other App pools as well.
Whether the Default App pool crashes and shut down will affect other App pools running in the same farm / IIS ?
Other Pools
One pool can affect other in this cases.
Lock some global resource that the rest need to access and all pools gets time outs.
Eat the servers power with bad loops.
Each pool have their space that work aside from the other, so general speaking you need to look for what they have common, like if you use session database and the one locks it for long time, and the other is gets time outs many time together with the first one and fell also on Rapid-fail protection.
Pool it self
The pool is connected with many apps, so when this pool crash, is affect and all apps/web sites that are connected with this.
When this is a problem.
When the pool crash many times and is felt on the "Rapid-Fail Protection" that make the pool to permanently shut down.
When some site is keep the pool inside a loop that eats all resource of it and the power of your server.
here is an example : How do I crash the App Pool?
For the first case you must go to your pool and turn off the "Rapid-Fail Protection". For the second case you need to locate the problem and isolate.
More to read:
Rapid Fail Protection
Configuring Rapid-Fail Protection
IIS app pools, worker processes, app domains
Related
Platform: Windows Server 2016
Website: Default website using https
Custom app pools - 4 - one used as the default for our application[
Recycle settings: default
We have an issue with our web servers, where occasionally the existing worker process stops processing requests. But for whatever reason, IIS does not spin up a new worker process. The net effect is that the web server is dead in the water.
Is it possible that the existing process is not terminated until a new child process successfully announces itself?
This problem only occurs in the app pool that our application creates, and uses as the default app pool. (The other worker threads probably don't do enough to run into this situation)
The attached screenshot taken from our monitoring shows the server doing nothing, until we manually intervened and recyled IIS.
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 have a ASP.NET/WCF app hosted in Window Server 2012 (IIS 7). We used the basicHttpBinding. This ASP.NET/WCF application exposes two methods; one is to receive messages and the other is to download a text file (1MB) onto the server.
On another server, we have ASP.NET hosted in Window Server 2012 (IIS 7) which is the client that consumes the exposed method mentioned earlier. This client application sends a message and uploads a text file at a high frequency. This communication between this ASP.NET/WCF application and client application works fine for a few hours until we get the following error at the ASP.NET/WCF side.
Application pool 'XXXXXXXXXX' is being automatically disabled due to a series of failures in the process(es) serving that application pool.
So, could you please shine some light regarding this issue that we are facing?
This is due to something called "Rapid Fail Protection." When your underlying application crashes a certain number of times in a certain time period, the application pool is automatically disabled.
The default settings are 5 crashes in 5 minutes, but you can configure this yourself. See this link for details.
I've a web application running on windows server 2008 x64. Application use cache to save some data but while working this data disappeared. it seams that the application pool recycles.
I disabled the application pool recycling (no over lapping recycle, privet memory limit is zero also the virtual memory is zero and no interval limits specified ).
after these configurations application pool recycles!
is there any default windows configuration that limits the application pools worker process?
I am in a bit of confusion here. In IIS 5.0 all the ASP.NET applications run inside the same worker process(aspnet_wp.exe). The various applications are isolated by appdomain. I believe the fundamental functionality of an appdomain is to provide application isolation within a process. Now on to IIS 6.0. I have read about application pools in IIS 6. A lot of sites say that in IIS 5.0 when there is a problem with an application it affects the other applications. But isnt that safeguarded by appdomains? I am being told that application pools in IIS 6.0 prevent that mishaps. I am a bit confused here as to what exactly is advantage that application pools provide over IIS 5.0. I have also been told that in IIS 6 worker process isolation mode, configuring different application pools(and thereby different worker processes) is a perfomant thing to do. But spawning new processes increases the memory utilization and how can it be claimed to be a performant way to do things? Also how does the HTTP.SYS know to route the request to the concerned application poool?
Don't get application pools and AppDomains confused. An AppDomain is a isolation boundary within a process. They are designed to isolate and provide security around managed code that is executing.
Application pools are a feature of IIS that allow a pool to handle requests for multiple sites. They handle this by running multiple AppDomain instances in the worker processes (aspnet_wp.exe, or w3wp.exe). Although technically you can run multiple AppDomain instances per site, generally it is a single AppDomain per IIS Application.
If you have multiple sites in a single application pool (and this sharing the worker processes), if one of those sites starts consuming a lot of resources, this can directly effect the other sites running in the same application pool.
By grouping (and segregating) sites in logical groups (application pools), you can better manage how sites behave.
HTTP.SYS is a kernel mode driver stack that is part of the Windows subsystems. It provides management of the HTTP protocol in kernel mode (versions prior to IIS6 used winsock in user mode). With HTTP.SYS running at the kernel level, should a worker process fail, the request can be queued, and then forwarded to a new worker process which will be spun up.
When you create a site in IIS6, it registers the site with HTTP.SYS which can then route requests coming in to the appropriate worker process.
The Appdomain is about sharing data
http://msdn.microsoft.com/en-us/library/system.appdomain.aspx
and in IIS 6 you can append several applications to an application pool. If you have 2 applications in the same application pool and one of them keeps crashing, it affects the other and IIS will decide to shutdown the whole application pool because of the instability.
Therefore, if you have critical applications, it is recommended to keep them in their own application pool. If you have multiple apps in IIS, you route the requests with the hostheaders (or extra external IIP addresses)
extra resource that recommends an application pool for each production website: http://forums.iis.net/t/1151476.aspx
a nice resource which explains the difference between 5.0 and 6.0 with isolation:
http://www.tech-faq.com/understanding-iis-5-and-iis-6.html