Asp net - customErrors mode Off error when trying to access working webpage

Question

I have created an asp net webpage and have uploaded it onto a webserver  However when I try to view the page remotely  I get errors about the customerror tag in the web config file  The page works locally with no errors or warnings  Also if I upload the page as a  html file  I can view it fine remotely  I have seen a lot of other people with this error  but the  solutions  just say to change the customErrors tag to  Off   which I have done and does not work  do you know is there an issue with the webserver or what could be the problem here    Here is the error page      Server Error in     Application    Runtime Error   Description  An application error occurred on the server  The current custom error  settings for this application prevent the details of the application error from being  viewed remotely  for security reasons   It could  however  be viewed by browsers running  on the local server machine       Details  To enable the details of this specific error message to be viewable on remote  machines  please create a  tag within a  web config  configuration file  located in the root directory of the current web application  This  tag  should then have its  mode  attribute set to  Off            lt configuration gt       lt system web gt           lt customErrors mode  Off   gt       lt  system web gt   lt  configuration gt       Notes  The current error page you are seeing can be replaced by a custom error page by  modifying the  defaultRedirect  attribute of the application s   configuration tag to point to a custom error page URL           lt configuration gt       lt system web gt           lt customErrors mode  RemoteOnly  defaultRedirect  mycustompage htm   gt       lt  system web gt   lt  configuration gt    And here is my web config file    lt  xml version  1 0   gt   lt configuration gt      lt system web gt       lt customErrors mode  Off   gt     lt  system web gt      lt system web gt       lt compilation debug  true   gt       lt authentication mode  None   gt     lt  system web gt   lt  configuration gt

User · Answer

Sometime in the future Comment out the following code in web.config

 <!--<system.codedom>
    <compilers>
      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701" />
      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
    </compilers>
  </system.codedom>-->

update the to the following code.

<system.web>
    <authentication mode="None" />
    <compilation debug="true" targetFramework="4.6.1" />
    <httpRuntime targetFramework="4.6.1" />
    <customErrors mode="Off"/>
    <trust level="Full"/>
  </system.web>

User · Answer

You should only have one  lt system web gt  in your Web Config Configuration File    lt  xml version  1 0   gt   lt configuration gt     lt system web gt       lt customErrors mode  Off   gt       lt compilation debug  true   gt       lt authentication mode  None   gt     lt  system web gt   lt  configuration gt

User · Answer

For example in my case I accidentaly changed role of some users to incorrect  and my application got error during starting  NullReferenceException   When I fixed it - the app starts fine

[asp.net] Asp.net - <customErrors mode="Off"/> error when trying to access working webpage

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