[Owncloud] This page isn't working. www.yourdomain.com is currently unable to handle this request. HTTP ERROR 500

You did not provide any module versions so the list above is not helpful.

In general, when it comes to php:

  • Use the very same version for the apache module and the CLI version
  • You must install the php modules for the required version (e.g. php74-php-xml for php 7.4)

I’d recommend using php 7.4 from the epel repository. There are various guides on the web, such as How To Install PHP 7.4, 7.3 & 7.2 on CentOS 7 - TecAdmin how to get this repository working

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