Anyway, it seems that LJ is either crashing, or dropping the connection, when it recieves an empty Cookie: or Cookie2: header. This is a bit of a problem, as it seems that Opera on my Nokia 9500 is sending them a bit too frequently, meaning I can't read LJ on it.
$ telnet www.livejournal.com 80 Trying 184.108.40.206... Connected to livejournal.com. Escape character is '^]'. GET / HTTP/1.1 Host: www.livejournal.com Cookie: Connection closed by foreign host.
Same with an empty Cookie2. I'm reasonably sure that it is valid for these headers to be empty.