1script - 7:37 pm on Aug 13, 2011 (gmt 0)
I wouldn't say specifically on the 4th. I see a lot of them dated anywhere between 3rd and 11th. In fact, 8th looks more like the epicenter to me.
Are your "connection refused" and "network unreachable" errors mostly on August 4th? I suddenly see a number of those on a site previously without problems.