ASP NET 2 0 - How to use app offline htm

Question

I ve read about the app offline htm file which can be placed within the root of a  NET 2 0 application which will in essence shut down the application and disable any other pages from being requested   I ve placed the file in the root  and my site still loads   I went into default documents in IIS and set it to app offline htm and the site still loads  this might have been a caching issue though   Anyway  has anyone run into issues using this  Am I doing something wrong

User · Answer

Make sure filename extensions are visible in explorer and filename is actually   app offline htm  not   app offline htm htm

User · Answer

Note that this behaves the same on IIS 6 and 7 x  and  NET 2  3  and 4 x   Also note that when app offline htm is present  IIS will return this http status code   HTTP 1 1 503 Service Unavailable   This is all by design  This allows your load balancer  or whatever  to see that the server is off line

User · Answer

Make sure your app offline htm file is at least 512 bytes long  A zero-byte app offline htm will have no effect   UPDATE  Newer versions of ASP NET IIS may behave better than when I first wrote this   UPDATE 2  If you are using ASP NET MVC  add the following to web config    lt  xml version  1 0   gt   lt configuration gt       lt system webServer gt           lt modules runAllManagedModulesForAllRequests  true    gt       lt  system webServer gt   lt  configuration gt

User · Answer

I ran into an issue very similar to the original question that took me a little while to resolve   Just incase anyone else is working on an MVC application and finds their way into this thread  make sure that you have a wildcard mapping to the appropriate  Net aspnet isapi dll defined  As soon as I did this  my app offline htm started behaving as expected     IIS 6 Configuration Steps  On IIS Application Properties  select virtual Directory tab   Under Application Settings  click the Configuration button   Under Wildcard application maps  click the Insert button   Enter C  WINDOWS Microsoft NET Framework64 v4 0 30319 aspnet isapi dll  click OK

User · Answer

Make sure that app offline htm is in the root of the virtual directory or website in IIS

User · Answer

Possible Permission Issue  I know this post is fairly old  but I ran into a similar issue and my file was spelled correctly   I originally created the app offline htm file in another location and then moved it to the root of my application   Because of my setup I then had a permissions issue   The website acted as if it was not there   Creating the file within the root directory instead of moving it  fixed my problem    Or you could just fix the permission in properties- security   Hope it helps someone

User · Answer

I have used the extremely handy app offline htm trick to shut down update sites in the past without any issues   Be sure that you are actually placing the  app offline htm  file in the  root  of the website that you have configured within IIS   Also ensure that the file is named exactly as it should be   app offline htm  Other than that  there should be no other changes to IIS that you should need to make since the processing of this file  with this specific name  is handled by the ASP NET runtime rather than IIS itself  for IIS v6    Be aware  however  that although placing this file in the root of your site will force the application to  shut down  and display the content of the  app offline htm  file itself  any existing requests will still get the real website served up to them   Only new requests will get the app offline htm content   If you re still having issues  try the following links for further info   Scott Gu s App Offline htm  App Offline htm and working around the  IE Friendly Errors  feature  Will app offline htm stop current requests or just new requests

[asp.net] ASP.NET 2.0 - How to use app_offline.htm

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