I'd recommend to always set "Detect IP address automatically" so at least your external IP will be correct for sure. Also, you have to enable File Transfer Plus itself in Windows Firewall, not just MSN Messenger (it should ask to be added when you use it for the first time).
How do you connect to the internet? Do you have a router or a shared internet connection?
Latest File Transfer Plus: 1.1 RELEASE (1.1.14)
In development: 2.0
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