Connection issues in Firewall/VPN environment

Article:TECH32252  |  Created: 2007-07-17  |  Updated: 2007-08-23  |  Article URL
Article Type
Technical Solution


When connecting to a machine that is located behind a firewall, or when you are connecting through a restricted VPN, you receive a black screen or other connectivity issues.


-Carbon Copy 6.x


This is caused by a restriction of some of the network communication.


In a secure environment, or when connecting to a machine behind a firewall, the following network ports must be open for full communication to take place:

 TCP  UDP Usage 
 80   Altiris Agent communication to the Notification Server 
 1680   Carbon Copy Agent communication
 [random]   Controlling machine connecting to port 1680 on the Agent*

* When you remotely control a machine, a random TCP port is chosen by Windows on the controlling machine to connect to port 1680 on the target machine. In a typical firewall configuration, outbound communication is not restricted which permits communication back to the controlling machine over this randomly chosen port. If a firewall has outbound communication restricted with specific outbound traffic exceptions, Carbon Copy communication is likely to fail.

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