Description
Port
Protocol
URL
Used for the appliance to sync time
123
UDP
pool.ntp.org
Used for the appliance to sync time
123
UDP
clock.isc.org
Used for the appliance to sync time
123
UDP
time.nist.gov
Default automatic antivirus
updates
80
TCP
liveupdate.symantecliveupdate
.symantec.com
Default automatic antivirus
updates
80
TCP
liveupdate.symantec.com
Rapid response antivirus
21
TCP
update.symantec.com
Configuring your firewall for connections to public IM network servers
To enable IM filtering, you must configure your firewall to allow port connections
from your IM-filtering Scanner to the public IM network servers that you use.
Port connections to these servers from all other servers within your corporate
network should be blocked.
Table 2-2
lists the ports for which you must configure your firewall to allow
outbound connections to the Internet.
Table 2-2
Firewall port connection requirements
Ports
IM Network
5190
AIM
1863
MSN Messenger
5050, 80
Yahoo! Messenger
5222
Google Talk
In addition to these firewall changes, changes to your DNS configuration are also
required to enable IM filtering.
See
“Configuring your DNS for IM filtering”
on page 27.
Understanding system requirements
Ports used by Symantec Mail Security
24