Table: Ports used by Symantec Web Gateway describes the ports that Symantec Web Gateway communicates with. Ensure that your firewall allows traffic through these ports.
Table: Ports used by Symantec Web Gateway
Symantec Web Gateway
User-defined DNS servers
External DNS lookups, if configured
See Web addresses used by Symantec Web Gateway.
pool.ntp.org (by default)
Network Time Protocol
SNMP, if configured
User information from Active Directory, if configured
Central Intelligence Unit
Malware alerts or system alerts to remote syslog, if configured
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