Did you ever encountered this problem when viewing your sites in your browser ?
I get this error with Chrome:
Error 324 (net::ERR_EMPTY_RESPONSE): The server closed the connection without sending any data.
A blank page with Firefox
and "Diagnose connection problems" page with Explorer
When you reload the page, it works fine (in all browsers).
Is it the box the sites on or it's on my end ?
Oh yeah, looks like it's doing this with sites using scriptpulse (ain't sure about this one tho)