On occasion when DS-User tries to connect to DS-Client service, the following error might be reported: "The network location cannot be reached. For information about network troubleshooting see Windows Help (NetServerEnum)."
The issue happens due to Windows Domain group policy setting that does not allow a user account to initiate DS-User Java app and connect to DS-Client.
Review the Domain GPO and add a rule to allow the user account used to logon in DS-User to intiate DS-User and connect to the DS-Client service.
Alternatively, use to connect to DS-User a local user and member of the Local Administrators Group on the DS-Client server.