Quote from Privateer:
Babak :
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This data is user specific:
TCP & UDP Source Port: 1024 or higher (if your system needs a Source port)
TCP & UDP Destination Port: 4000
Destination IP address: 208.245.107.3 for gw1.ibllc.com; 208.245.107.4 for gw2.ibllc.com; 208.245.107.5 for gw3.ibllc.com
If you are unsure which IP address you should be connecting to please contact the Help Desk."
and
To connect the Trader Workstation through a proxy server, you should ensure that your proxy server can be configured to assign the following TCP/UDP ports and IP source and destination addresses:
TCP & UDP Source Port: 1024 or higher (if your system requires a Source port)
TCP & UDP Destination Port: 4000
Destination IP address: 208.245.107.3
It is the customer's responsibility to set up the necessary translation services (proxies) on their firewall as described here. Interactive Brokers recommends that you contact your Network support staff for assistance in configuring your TCP/UDP ports."
Conclusion - access to your IB account for trading purposes is simply not possible from "any" PC connected to the net.
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regards