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.