App_offline.htm Throwing HTTP 500 Errors On Production Box / How To Fix It
Feb 8, 2011
I have created an app_offline.htm file for an ASP.NET MVC2 application running on IIS7 / Win2008 64-bit, and ensured that it's over 512 bytes (it's 2KB right now). On my dev box running Visual Studio 2010, it works like a charm, but when I put it on the production box, all I get is the generic HTTP 500 error saying "The page cannot be displayed because an internal server error has occurred."
What's especially strange is that I don't get anything logged in the application event log, nor does ELMAH pick anything up. I've disabled custom errors, put FormsAuthentication location exceptions for the file, ensured I'm not referencing any other files (images, etc.), but nothing fixes it.
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Feb 22, 2011
The app_offline.htm file that ASP.NET serves returns the http status 503. This is the correct behavior for most situations. However, in the scenario where a specific URL is requested (e.g. [URL]), I'd like to change the returned http status to 200, while still returning http status 503 in all other situations. Is this possible?
The reason why I want to do this is whenever we do scheduled maintenance on our website, we use the app_offline.htm file, but we don't want our uptime monitoring service [URL] to report downtime during our scheduled maintenance.
I assume this would have to be at the IIS level because the app_offline.htm gets served very early on in the request processing cycle.
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Oct 4, 2010
using vb.net/asp.net 2005
when a user enters a bad email I am doing a check on this and throwing an exception message as follows, this works fine on the test site but for some reason the same code on the live site gives a "internal server error" (http code 500). The code below:
[Code]....
not certain why this is happening, I assume that it's some server or config difference between the test and live sites. has anyone seen this before? For a quick fix i'm registering javascript alert and showing the same text so it works but I would like to figure out why the code above is not working.
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Jan 11, 2011
We have had some problems with using a unmanaged DLL file written in Delphi. (Unable to load dll - not found...)The following code solved the problem on my local machine:
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1) The elusive DLL is copied to the ASP.NET temporary files folder2) To check this we get a list of files from that folder.3) The needed function is called with DLL-import.1 & 2 works perfectly - both run directly from Visual Studio 2010 and when uploaded to a webhotel3 works perfectly local, but causes the remote host to think a little and then return a HTTP 503 Service Unaviable error for the next few minutes...
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Jun 9, 2010
I've developed a fairly simple web service which receives an xml string, validates it and passes it on to our internal database. This has been written to enable one of our clients to send us idocs from their SAP system. The trouble is that, although the web service works fine from a .net program, over the internet, the client's SAP system can't access it. They either get just an http 200 back (rather than the status code that the web service should supply) or they get http 500 'Internal Server Error'. I was wondering if anyone else has had issue's with ASP.NET web services from non 1qs`asp.net applications, or whether anyone can give me any advice on debugging http 500 errors.
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Nov 23, 2010
Do anyone of you know how to handle XXX.X IIS HTTP errors in a web.config file? I tried doing the following:
<customErrors mode="On" defaultRedirect="error.aspx">
<error statusCode="403" redirect="error403.aspx" />
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<error statusCode="403.9" redirect="error403.9.aspx" />
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<error statusCode="404" redirect="error404.aspx" />
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But obviously that didn't worked, because the web.config file expects an integer as the statusCode value.
CONTEXT: WinServer 2003 - ASP.NET 3.5
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Mar 28, 2011
If I were to specify a page for redirect using the ASP.NET Custom Errors feature, would my application still spit out the HTTP status code for that particular error?
For example if had a line in my web.config that had all Internal Server Errors redirect to Errors/500.aspx and then I encountered a 500 error, I would then be redirected to my custom Errors/500.aspx page. Will my application still respond with a HTTP 500 at any point in this exchange?
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Jul 2, 2010
I have a C# web forms ASP.NET 4.0 web application that uses Routing for URLs for some reason custom errors defined in the system.web section of my web.config is entirely ignored and it will fall back the IIS errors.
This gets entirely ignored
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This would be a minor inconvenience except that by the fact it falls back to IIS native instead of my application it completely circumvents Elmah logging my 404 exceptions correctly.
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Aug 23, 2010
Normally, I use App_Offline.htm for taking the site offline. But occasionally, when I do that, the site just hangs (like in: browsers wait forever, server gives no response at all). This seems to happen on an updateable site when I change something, like a control and afterward, when it doesn't go quick enough (site hangs), I place App_Offline.htm in the root of the website.
In most cases, this immediately takes down my site. But occasionally it doesn't. In those cases, I cannot just stop the website (when I restart, the behavior continues). Stopping the application pool doesn't let me restart the same app pool. The only two solution so far is restarting the whole IIS web service.
I'd like to prevent this from happening. Is this a bug in IIS not "breaking all actions" when App_Offline.htm is found? I use IIS 7 with Windows 2008 SP2 64 bit.
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Jan 27, 2010
I regularly (every few days or so) publish my ASP.NET web project to the local web server.
But the weirdest thing keeps happening... a file called "app_offline.htm" keeps appearing, unbidden, in my web project!
I have deleted this file several times, it is not in source control, and AFAIK nobody else is tampering with the project. But practically every time I try to publish the project, my publish fails (Unable to add 'app_offline.htm' to the Web site. The file 'app_offline.htm' already exists in this Web site.Error: The operation could not be completed. Unspecified error), I go back to look at the project, and there it is again, large as life, and I suspect if it could it would be blowing raspberries at me.
Having read up a little about this file, I gather it's meant to be an easy way to take your app offline. But I didn't see anywhere that it's supposed to impose itself on you arbitrarily for no good reason.
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May 17, 2010
When I publish my ASP.NET MVC application it generates a app_offline.htm file to take the site offline while it updates the website and then deletes the file once the publish is successful.
This is cool and I really like the idea, but I want to create my own custom app_offline.htm file that the publish action is aware of and put it somewhere where it doesn't effect my development site - i.e. it doesn't sit in the root of my development site rendering it offline all the time.
EDIT: From the comments on Scott Gu's post about app_offline.htm, it seems that customization of the app_offline.htm file wasn't possible with VS 2005 - has this changed with VS 2008 and now VS 2010?
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Apr 21, 2010
I loved the features of using app_offline.htm on my ASP.NET WebForm based sites.
Upload the file and your app is immediately "offline". Snappy.
Now that I'm using MVC 2, I noticed that this no longer works.
Is there a way to get this behavior in ASP.NET MVC 2 like it did in WebForms?
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Dec 3, 2010
I have a web app that has an app_offline.htm file, this file is stored in source control along with everything else.
The problem I have is that each time I (or any other developer) do a get latest on the source I get the app_offline.htm file and then when I try to run the app all I see is the app_offline rather than the actual web site.
Is there way that I can stop this from happening?
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Mar 14, 2011
In quite some scenario's, placing app_offline.htm in the root is just right: you do some updates, the message appears while updating, and that's that. The idea is, as Microsoft puts it, that before anything is called, IIS first checks if app_offline.htm is there and if so, it cancels everything and displays it.
So for so good, but in many situations it doesn't work:
When you have a compile error in an ASPX page and a user links directly to it When you have conflicting assemblies When you have a parsing error in your web.config In the midst of removing / uploading the entire site.
A direct link to a static HTML page is still displayed as suchm File-not-founds, access-denieds are thrown before the message is shown Possibly more scenario's exist that fail. My point is: for any serious updating work, app_offline.htm is not suitable. I sometimes create a redirect in IIS, to another site, but another site may not always be available and it can confuse users.
Ideally, I'd want to keep the current location in the url location bar of the end-user, show the message, and have the page auto-refresh each minute to see whether the site is back, so that the user continues where he left of when the site comes back. While technically easy enough with a static page, it will fail for the above mentioned reasons the minute an error is thrown.
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May 10, 2010
I have placed an app_Offline.htm in the root of my IIS7 application. This works for calls to pages on the root, but not for calls to pages in a subfolder of the application.
How comes? And how to make it work also for subfolders?
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Sep 18, 2010
I get the message "This application is currently offline. To enable the application, remove the app_offline.htm file from the application root directory. "
However, this is no app_offline.htm file in the root directory. Where in the heck is it?
I am looking in the Solution Explorer, and I also looed in Windows Explorer . . . not a sign of it. ?
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Apr 9, 2010
i am trying to delete app_offline.htm programmatically but the code doesnot even get called as the app_offline does not other pages load. how should i delete the file after the updations have been done in the website. i know that i can delete the file manually but i dont want to do that.
code:
if(File.Exists(filename))
{
File.Delete(filename);
}
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Jul 31, 2010
i found app_offline.htm created automaticaly in my project while i was working on my website offline.
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Mar 2, 2011
have been using the Publish Web Site option VS 2005, and all of a sudden it quick working correctly and do not get an error message. Also, compiling the web site does not take as long as it did before. Now Pubish Web site only puts the bin folder and PrecompileApp.config file in the C:InetpubwwwrootOIAEmailMaint. Because I am working and testing this website sometimes I delete any previous files that was in the folder C:InetpubwwwrootOIAEmailMaint before Publish Web Site. I did notice when I was looking at the files I delete in the Recycle Bin that a app_offline.htm. Apparently I changed some kind of option by accident by I do not have a clue what.
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Dec 21, 2010
When I build my program, if there's one error that prevents it from running, instead of just getting the one error I'll get around 50 additional errors in addition to the real one such as:
Error 27 Validation (XHTML 1.0 Transitional): This name contains uppercase characters, which is not allowed.
Is there any way to not show these?
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Sep 2, 2010
After seeing the Hanselman "You are doing it wrong" video I start to use the Web Publish feature of VS2010.
What I'm really missing is that the websites sometimes gives errors while the site is publishing because the feature does not copy the app_offline.htm file to the server.
I do not want to start using MSDeploy scripts, because I have several sites and want to keep it simple.
Maybe there is a simple tweak to tell the wizard to copy and then delete the file.
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Dec 6, 2010
When I use WatiN to go to a specific web page, how can I fake the HTTP referrer with a query string (i.e. request is from google search with query string q=search_term)? So I can verify that the response header has the 301 redirect for specific referrer URL.
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Jul 15, 2010
i redirect a page from http to https using http module begin request handler .i am calling webservice using ajax but it is saying webserice not defined .which otherwise works fineits work fine when rediect page in page_load instead .but i need to add function for https to http in every page. i still not know why ajax is not working when i use http module for redirect
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Dec 2, 2010
I am having problem redirecting error when error is http 500 or http 403 locally running this site there is no problem it gets redirected to my errorpage.aspx. But when deployed at server, it does not get .tried putting try and catch in page_load and in global.asax and I have set Application_Error to redirect to that page and also set <customErrors defaultRedirect to that page also
error
statusCode="500"
redirect="/errors/errorpage.aspx?error=500"
/>
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Apr 14, 2010
RedirectResult is doing a HTTP Get. I want a redirect that does a Http POST
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