vRealize Automation requires the system administrator to identify all hosts using a fully qualified domain name (FQDN). In a distributed deployment, all vRealize Automation components must be able to resolve each other by using an FQDN. The Model Manager Web service, Manager Service, and Microsoft SQL Server database must also be able to resolve each other by their Windows Internet Name Service (WINS) name. You must configure the Domain Name System (DNS) to resolve these host names in your environment.
vRealize Automation does not allow navigation to hosts that contain the underscore (_) character in the host name.