500 Error on AppHarbor but downloaded build works on my machine

Question

I m using Visual Studio 2013 on Windows 8  I have a web service built off ServiceStack  Everything works fine on my machine but when deploying it to AppHarbor I get a 500 error  I set customErrors mode  off  and I still get a 500 error with no stack trace   According to AppHarbor s FAQ      If enabling Custom Errors doesn t produce a stacktrace  then that s indicative of a configuration problem that prevents the ASP NET runtime from initializing  You can debug such problems by deploying your app  either built locally or build output downloaded from AppHarbor  to a full IIS running on your local machine  You must configure the application pool to run in Integrated Pipeline mode to properly replicate AppHarbor s environment    So I did this  I downloaded the build output from AppHarbor and ran it on my local IIS and it worked fine   The AppHarbor Errors page says     No errors to display    And a AppHarbor s log session feature displays no meaningful information      2013-12-31T09 55 20 886 00 00 appharbor web 1 Created new worker  version 1388526921    2013-12-31T09 55 24 864 00 00 appharbor web 1 Warming up  version 1388526921    2013-12-31T09 55 32 134 00 00 appharbor web 1 Web worker root URL returned HTTP status code 500  Internal Server Error   version 1388526921    Any suggestions   -- for references  here s an outline of my web config    lt  xml version  1 0  encoding  utf-8   gt   lt  --   For more information on how to configure your ASP NET application  please visit   http   go microsoft com fwlink  LinkId 169433   -- gt   lt configuration gt     lt configSections gt       lt sectionGroup name  dotNetOpenAuth  type  DotNetOpenAuth Configuration DotNetOpenAuthSection  DotNetOpenAuth  gt         lt section name  openid  type  DotNetOpenAuth Configuration OpenIdElement  DotNetOpenAuth  requirePermission  false  allowLocation  true    gt         lt section name  oauth  type  DotNetOpenAuth Configuration OAuthElement  DotNetOpenAuth  requirePermission  false  allowLocation  true    gt         lt section name  messaging  type  DotNetOpenAuth Configuration MessagingElement  DotNetOpenAuth  requirePermission  false  allowLocation  true    gt         lt section name  reporting  type  DotNetOpenAuth Configuration ReportingElement  DotNetOpenAuth  requirePermission  false  allowLocation  true    gt       lt  sectionGroup gt     lt  configSections gt     lt appSettings gt              lt  appSettings gt     lt connectionStrings gt              lt  connectionStrings gt     lt system web gt       lt customErrors mode  Off  gt       lt  customErrors gt       lt httpHandlers gt         lt add path     type  ServiceStack WebHost Endpoints ServiceStackHttpHandlerFactory  ServiceStack  verb       gt       lt  httpHandlers gt       lt compilation debug  true    gt     lt  system web gt     lt system webServer gt       lt validation validateIntegratedModeConfiguration  false    gt       lt handlers gt         lt add path     name  ServiceStack Factory  type  ServiceStack WebHost Endpoints ServiceStackHttpHandlerFactory  ServiceStack  verb     preCondition  integratedMode  resourceType  Unspecified  allowPathInfo  true    gt       lt  handlers gt       lt directoryBrowse enabled  true    gt     lt  system webServer gt     lt runtime gt       lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt         lt dependentAssembly gt           lt assemblyIdentity name  MongoDB Driver  publicKeyToken  f686731cfb9cc103  culture  neutral    gt           lt bindingRedirect oldVersion  0 0 0 0-1 8 2 34  newVersion  1 8 2 34    gt         lt  dependentAssembly gt         lt dependentAssembly gt           lt assemblyIdentity name  MongoDB Bson  publicKeyToken  f686731cfb9cc103  culture  neutral    gt           lt bindingRedirect oldVersion  0 0 0 0-1 8 2 34  newVersion  1 8 2 34    gt         lt  dependentAssembly gt       lt  assemblyBinding gt       lt  -- This prevents the Windows Event Log from frequently logging that HMAC1 is being used  when the other party needs it   -- gt       lt legacyHMACWarning enabled  0    gt     lt  runtime gt     lt uri gt       lt  -- The uri section is necessary to turn on  NET 3 5 support for IDN  international domain names            which is necessary for OpenID urls with unicode characters in the domain host name            It is also required to put the Uri class into RFC 3986 escaping mode  which OpenID and OAuth require  -- gt       lt idn enabled  All    gt       lt iriParsing enabled  true    gt     lt  uri gt     lt system net gt       lt defaultProxy enabled  true    gt       lt settings gt       lt  settings gt     lt  system net gt     lt dotNetOpenAuth gt       lt  -- This is an optional configuration section where aspects of dotnetopenauth can be customized  -- gt       lt  -- For a complete set of configuration options see http   www dotnetopenauth net developers code-snippets configuration-options  -- gt       lt openid gt         lt relyingParty gt           lt security requireSsl  false  gt           lt  security gt           lt behaviors gt             lt  -- The following OPTIONAL behavior allows RPs to use SREG only  but be compatible                          with OPs that use Attribute Exchange  in various formats   -- gt             lt add type  DotNetOpenAuth OpenId RelyingParty Behaviors AXFetchAsSregTransform  DotNetOpenAuth    gt           lt  behaviors gt         lt  relyingParty gt       lt  openid gt       lt messaging gt         lt untrustedWebRequest gt           lt whitelistHosts gt           lt  whitelistHosts gt         lt  untrustedWebRequest gt       lt  messaging gt       lt  -- Allow DotNetOpenAuth to publish usage statistics to library authors to improve the library  -- gt       lt reporting enabled  true    gt     lt  dotNetOpenAuth gt   lt  configuration gt

User · Answer

Just a wild guess   not much to go on  but I have had similar problems when  for example  I was using the IIS rewrite module on my local machine  and it worked fine   but when I uploaded to a host that did not have that add-on module installed  I would get a 500 error with very little to go on - sounds similar  It drove me crazy trying to find it   So make sure whatever options addons that you might have and be using locally in IIS are also installed on the host    Similarly  make sure you understand everything that is being referenced used in your web config - that is likely the problem area

[servicestack] 500 Error on AppHarbor but downloaded build works on my machine

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