You need to configure a proxy setting to be able to download reputation defintions
You need to run the Java LiveUpdate Configuration Settings tool.
"<DCS INSTALL PATH>\jre\bin\java.exe" -classpath "<DCS INSTALL PATH>\liveupdate\jlu.jar" com.symantec.liveupdate.config.editor.ConfEditor
By default the installation path of DCS manager is : "C:\Program Files (x86)\Symantec\Data Center Security Server\Server\"
Open a command prompt as Admin and type the following command (example):
"C:\Program Files (x86)\Symantec\Data Center Security Server\Server\jre\bin\java.exe" -classpath "C:\Program Files (x86)\Symantec\Data Center Security Server\Server\liveupdate\jlu.jar" com.symantec.liveupdate.config.editor.ConfEditor
After that you need to add a new property :
Property name: proxy
Property value: proxyhost:proxyport (replace by the IP addrese and port of the proxy server used to connect to internet)
Click on Ok
Click on Save
After that the DCS Manager will connect to the internet using this proxy.