A gravatar, or globally recognized avatar, is quite simply an 80×80 pixel avatar image that follows you from weblog to weblog appearing beside your name when you comment on gravatar enabled sites.
Listet auf, welche Ports man für welche Services (DNS, HTTP, SMTP, POP, IMAP, FTP, etc.) wie (intern, extern und Range) offen haben muss, damit der Service funktioniert.
T. Omori, and K. Maruyama. MSR '08: Proceedings of the 2008 international workshop on Mining software repositories, page 31--34. New York, NY, USA, ACM, (May 2008)