Hi,
Please refer to the following article:
"Unable to communicate with reporting component" and BAD GATEWAY error on SERVER/reporting
http://service1.symantec.com/support/ent-security....
Symantec Endpoint Protection Manager error: 403 "You are not authorized to view this page" on Home, Monitors, and Reports pages.
http://service1.symantec.com/support/ent-security....
In IIS, ensure that "Read" is checked in the Symantec website component (in this case, content), under Properties > Home Directory.
Alease upload us the scm-server-0.log, catalina.out and IIS logs As per mithun Comments.