# Common Causes of Http Error 500.30 for ASP.NET Core Apps Failed to Start
An Http Error 500.30 indicates that an ASP.NET Core app has failed to start correctly. This error can be frustrating for developers and users alike, especially if they don’t know what caused it or how to fix it. Here are some of the most common reasons that could trigger this error:
## Incompatible Runtime Version
One of the most common reasons behind the Http Error 500.30 is the mismatch of .NET runtime version. If the ASP.NET Core application is running on an older .NET version than what is required, the application can’t start correctly and throw an Http Error 500.30.
## Missing or Corrupted Application Files
If the application files are missing or corrupted, the ASP.NET Core app will fail to start. For instance, you may see the error if some files related to your application have been deleted.
## Permission Issues with Configuration Files
If the configuration files of your application don’t have the required permission, it can cause the Http Error 500.30.
## Incorrect Deployment
Incorrect deployment is another issue that can cause this error. Issues during deployment include missing files, incorrect file structure, or incorrect file permissions.
## Issues with Database Server
This error can also occur when a database server is not available or has connectivity issues with the application.
# How to Fix Http Error 500.30 for ASP.NET Core Apps Failed to Start
Here are some solutions to fix the Http Error 500.30 for ASP.NET Core Apps Failed to Start:
## Check if the Correct .NET Runtime Version is Installed
To solve the mismatch of .NET runtime version, check the system requirements for your ASP.NET Core Application, and install the correct version of .NET Runtime. Once you have installed the correct version, restart the application and check if the issue is resolved.
## Check for Missing or Corrupted Application Files
If some files are missing or corrupt, restore them from the backup file, or reinstall the application.
## Fix the Permission Issues with Configuration Files
Check the permission of the configuration files of your application and ensure that the files have required permission.
## Correct Deployment Errors
Ensure that the application is deployed correctly, and all the files are in their correct location, with the proper file permission.
## Check Database Server Connectivity
Check if the SQL server is available, and ensure that there is no connectivity issue between the application and the database server.
In Conclusion
Http Error 500.30 for ASP.NET Core Apps Failed to Start can be frustrating for developers and users alike, but with the solutions mentioned above, you can quickly resolve the error and get your application up and running in no time.