ssl-message-flow.msc

msc {
    arcgradient=10;

    a [label="Client"], b [label="Server"];

    a=>>b [label="ssl negotiation packet\n\n"];
    a<<=b [label="'S' | 'N' | error\n\n"];

    --- [label="SSL handshake\n\n\n"];

    a=>>b [label="startup packet\n\n"];

    a<<=b [label="auth request | auth OK\n\n"];

    a=>>b [label="(optional) PasswordMessage\n\n"];
}