I've had my firewall on since day one of owning my MBP. I haven't had any messages come up since then asking for me to allow something to run. However, yesterday, I got 5 messages after rebooting and the only way to get them to go away is either to allow or deny. From what I can tell they are legitimate services and it doesn't look like an attack from a hacker. Anyone know why this may have happened? The messages are for nmbd, smbd, sshd-keygen-wrapper, krb5kdc, AppleVNCServer.bundle and iStatLocalDaemon.