1. Installed Windows Server 2012 in my VM
2. Ongoing with the installation of QSE Feb2021
 - after installing the same QS version as SSI's QS, it's still showing the error in the REST connector
3. Upgrading the Qlik Sense to the latest version with same OS version
4. Upgrading the OS version from 2012 R2 to 2016 in my VM
 -  successfully upgraded the OS
 - installed QSE Feb 2021 Patch 4
 - successfully connect to MAGENTO using REST connector
