Here is a list of the most common 500 Internal Server Errors.
Many client-side HTTP status codes also exist, like the popular 404 Not Found error, among others.
| Code | Explanation |
| 500.0 | Module or ISAPI error occurred. |
| 500.11 | Application is shutting down on the web server. |
| 500.12 | Application is busy restarting on the web server. |
| 500.13 | Web server is too busy. |
| 500.15 | Direct requests for Global.asax are not allowed. |
| 500.19 | Configuration data is invalid. |
| 500.21 | Module not recognized. |
| 500.22 | An ASP.NET httpModules configuration does not apply in Managed Pipeline mode. |
| 500.23 | An ASP.NET httpHandlers configuration does not apply in Managed Pipeline mode. |
| 500.24 | An ASP.NET impersonation configuration does not apply in Managed Pipeline mode. |
| 500.50 | A rewrite error occurred during RQ_BEGIN_REQUEST notification handling. A configuration or inbound rule execution error occurred. |
| 500.51 | A rewrite error occurred during GL_PRE_BEGIN_REQUEST notification handling. A global configuration or global rule execution error occurred. |
| 500.52 | A rewrite error occurred during RQ_SEND_RESPONSE notification handling. An outbound rule execution occurred. |
| 500.53 | A rewrite error occurred during RQ_RELEASE_REQUEST_STATE notification handling. An outbound rule execution error occurred. The rule is configured to be executed before the output user cache gets updated. |
| 500.100 | Internal ASP error. |
Errors Like the HTTP 500 Error
Many browser error messages are similar to the 500 Internal Server Error message because they're all server-side errors, like 502 Bad Gateway, 503 Service Unavailable, and 504 Gateway Timeout.Many client-side HTTP status codes also exist, like the popular 404 Not Found error, among others.
