All users got disappeared after Artifactory is upgraded to 5.6.2
Upgrade was performed without copying $ARTIFACTORY_HOME/etc/artifactory.properties of previously installed Artifactory version. Artifactory 5.6.2 relies on this file for moving and converting Users table from Artifactory's database to Access's.
In order to avoid the issue, please keep the artifactory.properties file of previous version before performing the upgrade
1. In the primary node, copy artifactory.properties file of previous version and overwrite it to the upgraded version's
2. Restart the primary node