Iis7 - Should Set .NET Application Pool To Auto-recycle
Mar 3, 2011
I have a number of ASP.NET (4.0) web applications that appear to leak (a small amount) of memory during each request. It is such a small amount, that for most use-cases, it will not grow to become a problem for weeks or even months at a time. I generally try to be good with closing any connections managed by the application, avoiding state-variables (or instance variables for my singleton), etc. My question is this - is this normal behavior for ASP.NET applications? I had turned off the default (IIS 7) behavior of recycling the app pool after 20 minutes of being idle. I do this since the application takes a few minutes to build its internal cache, and I want to avoid negatively impacting the user experience (and having them wait for the application to start when they issue the request).
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Dec 9, 2010
My application is running in a shared hosting environment. I do have a dedicated App Pool for my app. I've been doing some testing with 1st visits and precompile performance and have been tracking when my application starts up and shuts down.
In my Global.asax I have some logging code in Application_Start and Application_End. I can see from my logs generally when the application is idle and shuts down, then someone visits and it starts back up.
But, I also see cases where a shutdown is logged and then followed by another shutdown about 13 minutes later; without a startup in the middle.
I also see instances where there are two Startups in a row. I'm guessing these might be a recycle, but why wouldn't there be a shutdown log entry?
What I'd really like to know if there is a better way to track when my application starts, when it shuts down and if it is shutdown due to an idle pool, or from a recycle. I don't have access to the Windows Event Log so I need to do this from my app if possible.
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Dec 14, 2010
I'd like to describe strange issue I've noticed while analyzing my asp.net application in production and ask for some advice or opinion on the following matter.Application usually runs with some 80-90 MB of memory footprint. This seems stable since no memory leaks have been detected so far - no slight increase in memory usage over time. Yet, problem occurs when application pool recycles (I'm using shared hosting and judging by logs it occurs either when app is idle for 20 mins or every ~30 hours - something like that). The issue is that used memory almost doubles for some period on recycle - it goes to some 160-170 MBs without any explanation. This is confusing, since it is common claim that recycling should purge the memory and all other resources - at least I get it that way. System holds this amount of memory for some 7-8 hours and then memory usage drops to it's usual level of 90-100 MB, again, with no apparent reason (at least not know to me).
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Jun 22, 2010
my web applications app pool configuration is
PeriodicRestartMemory : 512000
PeriodicRestartPrivateMemory : 196608
although the virtual memory limit is higher than private memory, app pool is recycled with virtual memory limits exceeded errors in the event log (instead of private memory).
what is the reason for this? how could it exceed virtual memory limits before exceeding private memory limits? it seems that systems other allocations in virtual memory cause limits exceeded before applications private allocations exceed the limits, but what are those allocations of the system? or what is the root cause of this.
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Nov 18, 2010
My WCF Service isnt restarting after the app pool recycles. I have no control over how often the pool is recycled (shared hosting) .How do I get the wcf service to restart on pool-recycle ?
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Jan 28, 2013
I use Form Based Authentication in my siteIn my login page I have:
FormsAuthentication.SetAuthCookie(user.userName, true)
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Nov 1, 2010
All we have a global ships position tracking website which runs smoothly until IIS application pool recycles.When there is workerprocess recycling looks like session state expires as a result i loose all session data and when customer clicks refresh button he is redirected to login page.
In web.config Session state mode is set to InProc so i changed it to State Server but to my luck i have MAP object which is not serialiazable which is causing the maps from not appearing on the website.I tried adding serializable attribute to the object class but still not succesfull.Our website is accessed by our customers whose count is more than 1000.
Changing the session state mode from InProc to StateServer can really slow down the response time so
Is it good to go further fix the serailizable issues and move to state server?.
Is there any way I can retain my session data when application pool recyles?..
Stopping Application pool from recycling may not be a good idea considering health factor of web server.
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Aug 10, 2010
exactly as the question subject states - any ideas on how you might do this?I've been looking over the objects in System.Web.Hosting but nothing is standing out.
he reason? I'm getting one or two application errors which are typically occuring during a recycle (they happen about 25 hours apart and I've left my app pool recycle time at the default) and so I want to know if they're happening on a thread that's in the pool that's shutting down, or the one that's start(ed/ing) up.
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Aug 23, 2010
I've got an ASP.NET MVC app running under IIS7. It's using the default in-proc session management, which, according to all that I read, should lose the users' session after an app pool recycle.It doesn't seem to be losing it though. Even an IIS reset doesn't lose the session.Has something changed in IIS7 that keeps the session alive?
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Nov 22, 2010
I need an app pool recycle to be completely transparent to the users of my web app. I use ASP.NET 3.5 MVC 1.
Currently, upon an IIS 7 App Pool recycle all users logged into my web app are kicked out and are required to log back in (Context.User.Identity.IsAuthenticated is set to false). I employ SQL State Server, I use forms authentication and both are configured to use cookies. I was under the impression that .NET and/or IIS handles authentication of cookies.
However, every time the app pool is recycled Context.User.Identity.IsAuthenticated is set to false my users are kicked out and are required to log back in. I can see that the session id remains the same throughout logins, I can also view this session information in the database/state server.
Logon method:
[Code]....
Custom Controller Attribute:
[Code]....
WebConfig:
[Code]....
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Sep 1, 2010
I have made changes to my global.asax file so i want to recycle my web application to make the changes work. How to safely recycle my asp.net web application in production server?
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Sep 27, 2010
I have a Silverlight application using a WCF service hosted in IIS. I make use of some aspects of ASP.NET. I have the following folder structure for my application:
inetput
wwwroot
myapp
reports
{user-guid-folders}
report1.pdf
report2.pdf
App_Data (folder)
bin (folder)
Client_Bin (folder)
(various .aspx files, plus web.config, etc.)
The application dynamically generates reports and puts them in a folder with a GUID for the name which is unique to the user. This all works fine. However, when the user logs out I was cleaning up and deleting the PDF files in their folder, then deleting their GUID folder.
Deleting the files works fine, but if I delete the folder, the application recycles (which then removes all other users' sessions - I get a Session_OnEnd event for every user's session, and an Application_OnEnd event. The next user request causes the whole application to restart. So, while I can fix this by not deleting the GUID folder (which my application itself created), what is the reason for this? Is there any way I can prevent this from happening?
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Nov 25, 2010
We're currently deploying code to live pretty reguarly at the moment, but the down side is destroying user session data.
Is there a way of being able to recycle IIS without loosing session data, or is persisiting session state in SQL server or alike the only way?
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Dec 14, 2010
I have a CentOS 5.x server running Mono 2.8.1 and mod_mono 2.8 with apache2.
Every time I deploy a site from visual studio 2010 to my server by ftp, and navigate to the site, I get a 404 not found error page.
Sites in other subdomains (virtual hosts) are not affected.
Performing a restart of httpd using /etc/init.d/httpd restart fixes the problem, and I can view my ASP site again. Obviously restarting the entire httpd process is less than adequate.
My guess is that this is similar to application domains in IIS. Is there a way to 'recycle' and app domain in mod_mono? Can I set this to happen on deployment?
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Oct 21, 2010
I have an ASP.NET 2.0 web site hosted on Windows Server 2008 with IIS 7. I am using InProc session mode (specified in web.config). My client wants the timeout to be of 3 hours, meaning if the web site is idle, session should remain alive for 3 hours. Currently, what is happening is that if the web site is idle for 20-30 min. and if the user to tries to access any link, it redirects to login page.
I searched on internet and did all the possible settings (as follows):
In web config, session state, time out = 180 minutes.
In web config, forms authentication, time out = 180 minutes.
In IIS 7, Site->Features View->Session state - Session State Mode Setting: In Proc and Cookie Setting->Time out = 180 minutes
In IIs 7, Site->Features View->ASP->Services->Session Properties->Time out = 03:00:00 hours
In IIS 7, Application Pools->Site->Advanced Setting->Process Model->Idle Time-out = 180 minutes.
Even after doing all these settings, timeout has not increased and still if the web site is idle for 20-30 mins. and user tries to access the link, it redirects to login page.
Additional Information:
Whenever it redirects to login page after idle of 20-30 mins., and if I check the event log on server, it says something like (I am not sure whether this error is related to this particular issue or not):
"Forms authentication failed for request. Reason: The ticket supplied has expired"
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Jan 5, 2010
Currently, on our production IIS web farm, we host about 15 applications in a single App Pool (Default App Pool). There are two websites and about 13 virtual directories.A colleague has recommended that we change our IIS configuration so each application is a separate App Pool (with identical settings).
Is there any drawback or potential issues to doing this?Is it possible that ASP.NET applications could have been built with the requirements that they are all within the same App Pool?
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Aug 18, 2010
I'm trying to deploy an ASP.NET application using InnoSetup. I need to perform the following tasks:
Create an IIS application.
Create a new IIS application pool and set it's .NET version to 4.
Set the application pool of the new application to the new application pool.
I have found a script to create a virtual directory, but I need an application and application pool:
procedure CreateIISVirtualDir();
var
IIS, WebSite, WebServer, WebRoot, VDir: Variant;
ErrorCode: Integer;
begin
{ Create the main IIS COM Automation object }[code]......
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Mar 12, 2011
what is this error?how to handle it?Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.Description:An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.Exception Details: System.InvalidOperationException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.
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Feb 25, 2010
.NET application pool often overflowing. What Should I do for solving this problem? I am using singletton class for db connection. Also; My all db connection lines in using code block. So, it be dispose by .NET engine.
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Jan 31, 2011
I'm having issues with an ASP.net site (framework 3.5, IIS6 ) having very slow 'first hit' response times. I'm guessing that the issue is to do with the app pool recycling and having to warm up.
I got to thinking. As part of the site I have a HTTP module that spins up a 'never ending loop' on a separate thread which periodically (every 5 seconds) calls an sproc on SQL to make sure the database is still there. I'm wondering if a similar approach might work to get the site to make an HTTP request to "itself" as a keep alive.
My question is, before I go and do this, can anyone think of any reason why it won't work? For example, something like "oh no... ASP.Net will figure out that you're playing with yourself and not go through the whole page lifecycle... etc etc".
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Apr 15, 2010
I am asking this out of curiosity. I got the following error when this is not enabledAn attempt was made to load a program with an incorrect formatThis is related to loading a class library but this particular class library is compiled for any CPU with VS2010 64 bit running on Win7 64-bit
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Sep 22, 2010
I don't know if this is the right place to post, anyway:Once in a while the application pool of my website has stopped. After taking a look into the Windows logs, In can see in the System log the following: first I see 5 warnings, and then an error. The warning is:"A process serving application pool 'domain.com' suffered a fatal communication error with the Windows Process Activation Service. The process id was '1568'. The data field contains the error number."The process id is different for all 5 warnings. Then the error message is:Application pool 'domain.com' is being automatically disabled due to a series of failures in the process(es) serving that application pool.The warning:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-WAS" Guid="{524B5D04-133C-4A62-8362-64E8EDB9CE40}" EventSourceName="WAS" />
[code]...
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Apr 15, 2010
I have noticed how editing the web.config file in an application folder causes that application pool to recycle and pick up the changes.
How does IIS achieve this and is it possible to extend this functionality for another config file? Or is this dependency hard-coded somewhere? This is related to the possiblity of deploying configuration changes to a web server without having to edit the web.config, which is usually maintained by a different team.
Note that I don't want to manually invoke this recycle event, but have it work in the same way as with web.config. I'm aware that I could simply add these settings to web.config, but that's not what I've been asked to do.
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Mar 7, 2011
We have 64-bit Windows server and we need to explicitly enable the 32-bit mode in the Application Pool used by our web site, because the MS Jet Engine Data Provider used to import data from Excel does not run.
I am not sure, if we enable the 32-bit mode will we still get the advantage of 64-bit Server?
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Aug 17, 2010
I am working on Windows 2008 Server (64-bit). I want to execute my web service as a pure (native) 64 bit service. All the assemblies referred by the web service are currently built as 'AnyCPU'.
When I publish the web service to IIS, and configure it to run under a 64-bit application pool (by setting 'Enable 32-Bit applications' = false), attempt to access the web service gives the error 'Application is not a valid Win32 application' because of a BadImageFormatException. This appears to indicate that somewhere an attempt is being made to load a 32 bit assembly. But the error does not provide any information about which assembly was found with an incorrect format. I have checked all the assemblies in the bin folder using corflags and they are bit agnostic.
I tried using the fusion log and identified a bind failure with VJSharpCodeProvider (though my service is coded only in C#). The runtime is not able to find the VJSharpCodeProvider because it is present in the GAC as an x86 assembly.
Is VJSharpCodeProvider the cause of the problem? I guess this is not the case because of the type of exception (BadImageFormatException). If I am correct, then how do I identify the assembly that is causing this exception?
If I change the property 'Enable 32-Bit applications' to true for the application pool, the service works fine, but I need native 64-bit execution.
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