By default, Symantec Mail Security for Microsoft Exchange (SMSMSE) uses HTTP for LiveUpdate. In some organizations HTTP over port 80 is blocked, and HTTPS over port 443 is required for any HTTP traffic. In this scenario, SMSMSE can be configured to use HTTPS over port 443 for LiveUpdate traffic.
SMSMSE 7.9.0 and later
SMSMSE will now use HTTPS for all future LiveUpdate sessions.