telnet oyy.ru 80
Trying 81.176.239.210...
Connected to oyy.ru.
Escape character is '^]'.
GET / HTTP/1.0
User-Agent: opera
Accept: */*
Host: oyy.ru
Connection: Keep-Alive
Connection closed by foreign host.
Те же заголовки с домашней машины (тот же ip) проходят нормально.