> for a longer time now ftp.kernel.org is not reachable and > it seems it is not in the DNS anymore. > > What is another main server of the kernel sources and > not a mirror of the now dead one ftp.kernel.org?
kernel.org was h4xor'd - I assume they're bring ftp back when http comes back. IIRC Linus is hosting it somewhere else. Google will find it :)

