I am having the same problems as this fella, i have went through all the steps and have even went as far as contacting mcafee to see if the fire wall issue was on there end. and it wasnt. i guess the next step to to post my system info. here it is...

1. windows version vista
2. mcafee fire wall and windows firewall (window is disabled)
3. 14 gb left outta 100gb memory
4. using cable for connection
5. using d-link router, (never had a problem with it before)
6. im in my condo, under my own connection
7. using 4.18.3 limewire, java is version 6
8. internet provider is shaw cable
9. the test passed
10.not sharing the connection
11.i have used limewire before and have never had these problems
12.i do see the brick wall and have tried to disable my fire wall but still nothing
13.not sure what port forwarding means
14.using mcafee
15.im in canada