If you receive that error when trying to access your WordPress installation, follow these steps:

1. Check your WordPress files for permissions above 755. Our servers run in SuExec mode so the maximum allowed permissions are 755, all permissions above 755 will result in Internal Server Error. You can find which files exactly give the error from your cPanel > Error log.

After that, you can change the permissions from cPanel > File Manager or with your favorite FTP client.

2. Check your WordPress .htaccess file for bad directives. It is located in your WordPress installation directory.

For more information about the 500 ISE error you can check this article.

If you have problems with your WordPress, ask your host for assistance. SiteGround provides the best WordPress hosting and such requests are handled with ease.