Hi, I use my MBP 13" for browsing and FTP using wifi/3g broadband. I saw the firewall was turned off after reinstalling Lion so I turned it on. Is there a danger if it is off? I had it off for a week. Also, which should I check: block all incoming connections automatically allow signed software to receive incoming connections enable stealth mode i am having some ftp transmission issues with my broadband 3g card. don't know if this is related to turning firewall on and clicking "automatically allow signed software.." and "enable stealth mode." Please help. Thanks.