Hi,
I'm not quite sure of what you mean, since the "?" at the end... unless it is a "?" into your mind about all that.
anyway, if you mean that you've tried all that without succes...
maybe there is something there, to do with your ISP...
I do remember, when I was with an other ISP, for a while LimeWire was still able to connect (oftens indicating though, the presence of a firewall), but was also very oftens unable to download or upload... and so went from connecting to waiting for sources or needing more sources, and back to waiting for sources... of course, that also, is the normal behaviour when the file is rare, say, only one source, and that source is gone to sleep or to the loo or whatever it's going to... but then, obviously, when you choose a well represented file, there aint any problem anymore, and everything goes fine again.
When the ISP is responsible, it woudn't change...
May be you should see for your ISP's reputation on the net, there are such sites... unfortunately, I don't know anymore their address... maybe a google search... or someone here having the datum.