The error "Unable to verify credentials for vRanger Catalog database" is displayed duirng installation process
When vRanger host has full installation of SQL server already installed , the default hostanme during the installation of vRanger installation package defaults to .\VRANGERPRO and the actuall servername of SQL server is .\INSTANCENAME.
When prompted during the installation change the default server name to that of the SQL SERVER HOSTNAME i.e. .\INSTANCENAME
To get the active hostname of a windows machine. Open command pomrpt and type: "hostname"