I'd be a bit hesitant to tell you to update your Java (don't think it would help anyway) as 4.8.1 is quite an old version & some LW versions behave very strangely with different Java versions. Let me ask a guru.

Like I said, I don't know that this would make a diff anyway... your connection & firewall status are fine. I'm still thinking it's your ISP. I'll get back to you...