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ASP.NET Hosting Common Errors

 

Troubleshooting common hosting issues

In this section, we will look into some of the common problems that you can face while hosting a Blazor application.
  • If you are unable to open the website and get a DNS not found error
Check if the hostname is configured correctly in the host file. Make sure that your machine is not connected to any VPN server. Also, if you are using any Web proxy then disable it.
  • HTTP Error 500.19 – Internal Server Error - The requested page cannot be accessed because the related configuration data for the page is invalid.
This error message is clear. The publish folder is inaccessible because of insufficient permissions. Grant Read permission to the IIS_IUSRS group on the publish folder so that it can access Web.config file.
  • If the website is loading but data is not getting populated and you get a 500 Internal server error
Make sure that your connection string is in the correct format. The user id that you have specified in your connection string should have db_datareader and db_datawriter permissions. If the issue persists then provide the user with db_owner permission
  • If the data is not getting populated and you get an “operation not allowed” exception
This issue generally appears when you try to do a PUT, POST or DELETE operation in your web API. To mitigate this issue we need to alter the IIS setup configuration.

Navigate to Control Panel >> Programs and Features >> Turn Windows feature on or off. Then navigate to Internet Information Services >> World Wide Web Services >> Common HTTP Features and uncheck the “WebDAV Publishing” option and click ok. Refer to the image below,


  • “Failed to load <web API> : No 'Access-Control-Allow-Origin' header is present on the requested resource.
The cause of this error is that the client and the server of the application are not on the same port. The browser will restrict the application to make web API calls due to same-origin policy. To resolve this issue you need to enable Cross-Origin Requests (CORS) in your application.
Please refer to Microsoft documents on Enable Cross-Origin Requests (CORS) in ASP.NET Core  .
  • If you republish the application then do not forget to refresh your website as well as the application pool in IIS.

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