5XX error appears when there are internal problems with the server. They can be solved independently or by turning to a host. Make the error page well designed so you don't lose customers due to various server issues.When do 5XX server errors appear?5XX means any sort of internal problem, due to which the server cannot proceed with a request.Error 500 exampleMost often they appear because of the webmaster or administrator. They change either C级执行名单 the directory or the configuration, and the site starts working incorrectly. For example, the error may appear if the rights are misconfigured.To correct all this, it is better to undo all the changes. To do this, you need a log file or a long webmaster memory.Other Reasons for 5XX Errors1Authorized hosting rights exceeded. This happens when a file with unauthorized launch attributes is being processed.2PHP script execution time limits. For example, a standard limit is 300 seconds.3Not enough rights to process a file.4Problems with PHP. For example, when running in CGI, which means an application runs with provided variables. If so, the problem can only be solved with program code diagnostics. When it comes to encoding, you need a programmer to help you.It is not difficult to see the reason for the problem. All errors and their sources are displayed in the logs. In most cases, the reason is a site server issue. In this case, it is best to contact your host, ask them to explain the causes of the error and to correct it.If you are using free hosting, in most cases you will not be able to view the logs. To fix the problem, you will need to restore the site or find out what factors caused the crash.What are 5XX Server Errors? The most common are:500.0 — internal server error.500.11 — the application stops on the web server.500.12 — the application is restarting on the web server.500.13 — the web server is too busy.500.15 — direct requests for Global.asax are not allowed.500.19 — the configuration data is invalid.500.21 — unrecognized module.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.500.50 — A rewrite error occurred while handling the RQ_BEGIN_REQUEST notification.