Hi,
Please update us with Server OS details?
If possible please pass on scm-server-0.log file.
File would be present under tomcat\logs folder.
Go through the following articles:
Java -1 Errors and HTTP 500 errors when connecting to the Symantec Endpoint Protection Manager on a Windows Server 2008 64 bit
http://www.symantec.com/business/support/index?page=content&id=TECH96006&key=55357&actp=LIST
Java -1 Errors and HTTP 500 errors when connecting to the Symantec Endpoint Protection Manager on a Windows Server 2003 64 bit
http://service1.symantec.com/support/ent-security.nsf/docid/2008021214265748?Open&seg=ent