Port Numbers used by CollabWorx products

Table 1: List of the default¹ ports used by CollabWorx servers and collaborative application modules.

Server	TCP ports	UDP ports
Meeting Engine	443 and/or one port in 49701 - 49799 range	-
Secure Instant Messanger	443 and/or one port in 49501 - 49599 range	-
Audio[/video] retransmitter	443 and/or one port in 49601 - 49699 range	-
Video retransmitter	443 and/or one port in 49601 - 49699 range	-
Audio/Video in P2P mode (also for multicast version)		49601 - 49699

Notes:

Port assignment follows the IANA guidelines
There are very few well-known trojan horses using this port range
In actual configurations, the servers will usually use just one port number from the specified range or port 443 and one high-numbered port
In multicast mode, A/V module uses class D addresses 224.3.10.1+

Table 2: TI application numbers:

Application	TCP ports	UDP ports
Screen sharing	49300, 49299	-

Table 3: Ports used internally on machines running CollabWorx client software:

Function	TCP ports	UDP ports
SIM - CWx meetings communication	4403	-

Firewall requirements for client software:

¹All port numbers discussed here can be modified to any value by simple server side configuration change.

Page last modified: December 22, 2005