How To Crash The App Pool
Jun 15, 2010
Our ASP.NET 2 web application handles exceptions very elegantly. We catch exceptions in Global ASAX in Application_Error. From there we log the exception and we show a friendly message to the user.However, this morning we deployed the latest version of our site. It ran ok for half an hour, but then the App Pool crashed. The site did not come back up until we restored the previous release.How can I make the app pool crash and skip the normal exception handler? I'm trying to replicate this problem, but with no luck so far.Update: we found the solution. One of our pages was screenscraping another page. But the URL was configured incorrectly and the page ended up screenscraping itself infinitely, thus causing a stack overflow exception.
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Oct 24, 2010
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Jun 23, 2010
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Dec 26, 2012
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Protected Function chkExtchars(ByVal name As String) As String
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[Code] ....
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[Code]....
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Dec 6, 2010
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Attached Files CodeProblem.txt (40.3 KB, 35 views) Frinavale EMM Join Date: Oct 2006 Location: Canada
Posts: 6,545
#2:
Dec 9 '10
Listbox causes page to Crash getting "Internet Explorer cannot display the webpage" Instead of posting your entire code for us to review, could you post the specific portion of the code that you think is causing the problem (probably the retrieval or setting of the data).
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Nov 5, 2010
I couldnt help but notice that if you have a FileUpload-control, and then try to upload a file thats bigger(in bytes) then the allowed maxiumsize, then the site crashes or some wierd "Connection problem"-page shows up, atleast for me in Firefox...
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Feb 23, 2011
We recently migrated our ASP.NET 2.0 application to ASP.NET 4.0. It is running on Windows 2003 with IIS 6.0. After migrating, we have found that the ASP.NET 4.0 worker process w3wp.exe crashes intermittently with an 'Access Denied' exception. The stack trace of the exception does not point to any code written in our application. We are clueless as to what could be causing this. The worker process crashes when it makes a remoting call over http.
Event Type: Error
Event Source: ASP.NET 4.0.30319.0
Event Category: None
Event ID: 1325
Date: 2/22/2011
Time: 10:01:03 AM
User: N/A
Computer: SYS01
Description:
An unhandled exception occurred and the process was terminated.
Application ID: /LM/W3SVC/1/ROOT/Remoting
Process ID: 4660
Exception: System.TypeInitializationException
Message: The type initializer for 'ConvertClass_1' threw an exception.
StackTrace: at ConvertClass_1.Finalize()
InnerException: System.Management.ManagementException
Message: Access denied
StackTrace: at System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStatus errorCode)
at System.Management.ManagementScope.InitializeGuts(Object o)
at System.Management.ManagementScope.Initialize()
at System.Management.ManagementObject.Initialize(Boolean getObject)
at System.Management.ManagementClass.CreateInstance()
at ConvertClass_1..cctor()
For more information, see Help and Support Center at [URL] We have tried options like giving permissions to ASPNET account in the WMI services under 'Component Services' but to no avail. Has anybody else faced this issue?
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Nov 15, 2010
I want to get the user specified in the app pool identity (which for us is a domain user). I want to get this info in Application_Start.
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Mar 22, 2011
I have a timer running in my web application. Each time the application starts up, the timer is created. The issue is that the app pool ends after an idle period which also ends the timer. The next request causes the app pool to start back up and a new timer is created.
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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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Nov 18, 2010
I've been getting this error recently, after several reloads of the same page:
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 So I am thinking there must be some queries or calls in the app I used incorrectly that causes them not to release the connection. Is there any tools out there that allows me to somehow peek into the pool to see who is hanging on to what?
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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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Jul 13, 2010
I have an IIS 6.0-based C#/ASP.NET web site with a SQL server backend.I want to generate some computationally expensive reports (summaries, search engine indexes, etc...) in idle CPU time. I need the reports to be generated from WITHIN the IIS App Pool so it knows the proper configuration settings and (harder to fix) avoids the nightmarish security restrictions I've been placed under.
Can I start threads inside the AppPool's process that won't tie up the CPU, so it can continue serving requests unfettered? If so, how? What code and libraries?
I imagine it involves ThreadPool and thread priorities, but I couldn't find good coverage of low-pri threads and their interaction with the IIS web server and App pool.
[EDIT] [URL] discusses using a Timer for this but doesn't directly state that the .NET framework will insure that the Timer thread is low-priority. This might be a solution, but is that assured?
[URL]
[EDIT] Interestingly, Stack Overflow itself seems to use IIS background threads for my purpose:
[URL] in the comments, everyone says their (no longer used) technique sucks, but this one in the comments makes sense to me...
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Sep 21, 2010
I have trawled the internet - to no avail. Woe is me.I have a .Net website running under a .Net framework 4.0 App Pool.The website references various assemblies that have been compiled for .Net 3.5.I have ensured that identical versions of the dll's and pdb's are in the bin folder of the the 3.5 code that I am trying to debug, and the reference path of the 4.0 web site. I.e. the code that I am trying to debug matched the assemblies that are loaded into the app pool's process.
When I attach the debugger using VS2008 with the solution for the .Net 3.5 code open, the breakpoints that I have set are marked as invalid (i.e. marked with an exclamation mark). When I hit refresh on a browser page that invokes the code that I am trying to debug, VS2008 raises an unmanaged code exception.I have researched In-Process Side-by-Side code execution, which is what is occurring in this instance, and is working very well; but for the life of me I cannot find any information on debugging in this scenario.It is not an option to convert the .Net 3.5 projects to use .Net 4.0, nor is it possible to convert them to use VS2010 and leave them targeting .Net framework 3.5
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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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