Well if he isn't going to answer I can as I am having an identical problem. In anwer to your question, Lordoftherings, here goes:

1) Windows XP
2) I believe I am using Norton firewall. Also, could be the Windows firewall. If this is important you will need to tell me where or how to check as to what I am using.
3) Ram = 512
4) 50 GB
5) Cable
6) LYNKSYS, Model = BEFSR41
7) Home
8) Version 4.9.4 - Java 1.5.0_04
9) Never had a problem with my old ISP provider. This only started happening when I upgraded. ISP was working fine for over a year of usage until I updgraded to 4.9.4.
10) Yes, sharing with one other computer via router but this was never a problem in the past with the old version of limewire.
11) This is a new problem with an experienced user.
12) I get message that says "Your Test Worked."