I see the errors in Apache error log:
[Sun Oct 21 02:02:51 2007] [error] mod_ssl: SSL handshake interrupted by system [Hint: Stop button pressed in browser?!] (System error follows)
[Sun Oct 21 02:02:51 2007] [error] System: Connection reset by peer (errno: 104)
[Sun Oct 21 02:08:11 2007] [error] mod_ssl: SSL handshake timed out (client 18.104.22.168, server domain.com:8443)
There are non fatal errors that are related to communication between the client and server. The reason of such errors can be closed browser on client side, or some communication issue. In most cases they can be ignored.