GigaTribe will run in direct connection mode only if your computer can receive incoming TCP connections from the Internet.
Incoming connections can be blocked at the following levels:
You must modify your router settings so that your router accepts incoming TCP connections from port 3728 to the computer running GigaTribe.
Public Port from: 3728 to 3728
Local Port From: 3728 to 3728
Local Address / Server address: Local IP address of the computer running GigaTribe (192.168.1.10 for instance)
Most firewalls will ask whether or not you want to block GigaTribe when the software attempts to receive incoming connections from the Internet.
Some antivirus programs have an embedded firewall. If this is the case, make sure you have granted GigaTribe the right to receive incoming Internet connections.