I am running IIS on Windows Server 2016 hosting a MediaWiki site with a locally hosted MySQL 8.0 database. I was using PHP version 7.1.17 (non-thread safe) and it ran with no issues. After updating to version 7.1.20, I started to receive errors when accessing the MediaWiki site which indicates a failure to connect to the database server. The php.ini file is the same between versions (and thus the same extensions being loaded) and our phpinfo.php page loads without any issues, so I know that PHP is responding correctly. Reverting back to 7.1.17 resolves the problem. While running 7.1.20, the PHP error log does not indicate any problems. Can anyone offer any advice, or does anyone know what may have changed between these two versions to cause this issue?
Edit: for clarification, I just attempted using 7.1.18 and 7.1.19 and it still worked using those versions. Something has changed with 7.1.20 to cause this issue.
Thank you for any advice!