CustomErrors mode=Off :

Have you ever encountered a perplexing error page while running an ASP.NET web program? If so, you’re not alone. ASP.NET, though potent, might toss up errors that are ambiguous or not helpful, leaving developers befuddled. One regular scenario is coming across an error page with little or no data about what transpired. Thankfully, ASP.NET offers a corrective to this dilemma: the CustomErrors method.

Within ASP.NET, the CustomErrors is a configuration setting that gauges how error pages are flaunted to users when an unhandled exception arises in a web application. It sports three probable values for the CustomErrors method:

  1. Off: This mode exhibits intricate error messages to both local and remote users. It’s handy during development and debugging but ought to be switched off in production settings for security grounds.
  2. On: This mode showcases custom error pages to remote users but intricate error messages to local users (generally developers). It represents a decent concession between security and usability in production scenarios.
  3. RemoteOnly: This mode exposes custom error pages to remote users but intricate error messages to local users. It’s typically deployed in production settings to avert sensitive info from being out in the open.
CustomErrors mode=Off
CustomErrors mode=Off

The Predicament with CustomErrors Mode=”Off”

Whilst designatingCustomErrors mode=Off may sound like a direct solution to unveil intricate error messages during development, it can sometimes breed frustration when those intricate error messages flounder to transpire. If you find yourself in this situation, don’t fret – you’re in similar waters, and there exist steps you can implement to untangle the issue.

Tips for Fixing

1. Confirming Configuration Arrangements

Initiate by rechecking your web.config file to ascertain that the CustomErrors mode is verily set to “Off.” Sometimes, configuration arrangements can be overwritten or inherited from maternal configurations, so it’s pivotal to validate that the setting is executed properly at the precise level.

        <customErrors mode="Off"/>

2. Inspect IIS Arrangements

If you’re accommodating your ASP.NET program in Internet Info Services (IIS), make certain that the CustomErrors mode isn’t being stifled in the IIS arrangement. Voyage to the Error Pages slice in IIS Manager and warrant that the arrangements harmonize with your most wanted formation.

3. Scrutinize Application Cipher

Survey your application cipher to ensure that there exist no private error handling mechanisms that might be impeding with the CustomErrors mode. Scout for any overt error handling cipher or custom error pages that might be overpowering the standard conduct.

4. Debugging Implements

Employ debugging implements such as Visual Studio’s inbuilt debugger or third-party logging frameworks like Serglock or NLog to amass and break down intricate error messages. Occasionally, the predicament may not be with the CustomErrors mode itself but rather with how errors are managed or logged within the application.

5. Setting Mood into Consideration

Mull over the ambiance in which your program is in motion. Are there any security directives or constraints in place that could be influencing the flaunt of intricate error messages? Toil with your system overseers or hosting purveyor to assure that the ambiance is adjusted fittingly.


To conclude, whilst designating CustomErrors mode to “Off” can be a handy implement for debugging ASP.NET web programs, facing glitches with showcasing intricate error messages is not rare. By tracking the fixing tips sketched out in this blog arraignment and meticulously assessing your configuration arrangements, application cipher, and ambiance, you can competently diagnose and rectify any hitches pertaining to CustomErrors mode. Keep in mind, the aim is to hit a balance between usability and security, guaranteeing that your web program avails helpful error info to developers whilst shielding sensitive data from unauthorized access. readmore in official site