A Windows server that hosts the Manager Service component must meet additional requirements, in addition to those for all IaaS Windows servers.
The requirements are the same, whether the Manager Service host is a primary or backup.
No firewalls can exist between a Manager Service host and DEM host. For port information, see IaaS Windows Server Ports.
The Manager Service host must be able to resolve the NETBIOS name of the SQL Server database host. If it cannot resolve the NETBIOS name, add the SQL Server NETBIOS name to the Manager Service machine /etc/hosts file.