An exception occurred while processing your request Additionally another exception occurred while executing the custom error page

Question

I m trying to publish an MVC website as an Azure webrole   When I run it locally  everything works fine    But once I publish it to Azure and surf to some MVC action  I get this error      Server Error in     Application       Runtime Error      Description  An exception occurred while processing your request    Additionally  another exception occurred while executing the custom   error page for the first exception  The request has been terminated    I don t understand how the error handler can encounter an exception  because errors are handled in the default way   public class FilterConfig       public static void RegisterGlobalFilters GlobalFilterCollection filters                filters Add new HandleErrorAttribute               This is my web config    lt  xml version  1 0   gt    lt configuration gt     lt configSections gt       lt sectionGroup name  system web webPages razor  type  System Web WebPages Razor Configuration RazorWebSectionGroup  System Web WebPages Razor  Version 2 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  gt         lt section name  host  type  System Web WebPages Razor Configuration HostSection  System Web WebPages Razor  Version 2 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt         lt section name  pages  type  System Web WebPages Razor Configuration RazorPagesSection  System Web WebPages Razor  Version 2 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt       lt  sectionGroup gt     lt  configSections gt      lt system web webPages razor gt       lt host factoryType  System Web Mvc MvcWebRazorHostFactory  System Web Mvc  Version 4 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35    gt       lt pages pageBaseType  System Web Mvc WebViewPage  gt         lt namespaces gt           lt add namespace  System Web Mvc    gt           lt add namespace  System Web Mvc Ajax    gt           lt add namespace  System Web Mvc Html    gt           lt add namespace  System Web Routing    gt         lt  namespaces gt       lt  pages gt     lt  system web webPages razor gt      lt appSettings gt       lt add key  webpages Enabled  value  false    gt     lt  appSettings gt      lt system web gt           lt httpHandlers gt         lt add path     verb     type  System Web HttpNotFoundHandler   gt       lt  httpHandlers gt        lt pages         validateRequest  false          pageParserFilterType  System Web Mvc ViewTypeParserFilter  System Web Mvc  Version 4 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35          pageBaseType  System Web Mvc ViewPage  System Web Mvc  Version 4 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35          userControlBaseType  System Web Mvc ViewUserControl  System Web Mvc  Version 4 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  gt         lt controls gt           lt add assembly  System Web Mvc  Version 4 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  namespace  System Web Mvc  tagPrefix  mvc    gt         lt  controls gt       lt  pages gt     lt  system web gt      lt system webServer gt       lt validation validateIntegratedModeConfiguration  false    gt        lt handlers gt         lt remove name  BlockViewHandler   gt         lt add name  BlockViewHandler  path     verb     preCondition  integratedMode  type  System Web HttpNotFoundHandler    gt       lt  handlers gt     lt  system webServer gt   lt  configuration gt    This is Error cshtml    model System Web Mvc HandleErrorInfo         ViewBag Title    Error       lt h2 gt      Sorry  an error occurred while processing your request   lt  h2 gt    What can cause this exception  and why can t I reproduce it locally

User · Answer

I wasn t using Azure  but I got the same error locally   Using  lt customErrors mode  Off    gt  seemed to have no effect  but checking the Application logs in Event Viewer revealed a warning from ASP NET which contained all the detail I needed to resolve the issue

User · Answer

I had this problem with only with redirectMode  ResponseRewrite   redirectMode  ResponseRedirect  worked fine  and none of the above solutions helped my resolve the issue  However  once I changed the server s application pool s  Managed Pipeline Mode  from  Classic  to  Integrated  the custom error page appeared as expected

User · Answer

You can use Oracle ManagedDataAccess dll instead  download from Oracle   include that dll in you project bin dir  add reference to that dll in the project  In code   using Oracle MangedDataAccess Client   Deploy project to server as usual  No need install Oracle Client on server  No need to add assembly info in web config

User · Answer

If you add this to your web config transformation file  you can also set certain publish options to have debugging enabled or disabled    lt system web gt       lt customErrors mode  Off  defaultRedirect    Error aspx  xdt Transform  Replace   gt   lt  system web gt

User · Answer

When publishing to IIS  by Web Deploy  I just checked the File Publish Options and executed  Now it works  After this deploy the checkboxes do not need to be checked  I don t think this can be a solutions for everybody  but it is the only thing I needed to do to solve my problem  Good luck

User · Answer

First  set customErrors    Off  in the web config and redeploy to get a more detailed error message that will help us diagnose the problem   You could also RDP into the instance and browse to the site from IIS locally to view the errors    lt system web gt         lt customErrors mode  Off    gt    First guess though - you have some references  most likely Azure SDK references  that are not set to Copy Local   true   So  all your dependencies are not getting deployed   Get to the detailed error first and update your question   UPDATE  A second option now available in VS2013 is Remote Debugging a Cloud Service or Virtual Machine

[asp.net-mvc] "An exception occurred while processing your request. Additionally, another exception occurred while executing the custom error page..."

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