After doing a quick search, i did not find anything - but I'll keep looking.
My gut is telling me to keep denying it - possible a "worm" type program that sends out request to random IP addresses (yours) to see if it can get through to something or not.
(esconder) Pode usar algum HTML simples nas suas mensagens ou, se tiver uma inscrição paga, também pode usar o Editor de Texto Avançado. (pauloaguia) (mostrar todas as dicas)