Previously due to an exciting misconfiguration; access to rsync services to dipper.gentoo.org were open to the internet[0]. This was caught in a recent audit and we have disallowed access from the internet to rsync services on this host.
Please continue to use our public rsync services (rsync.gentoo.org or similar rotation.) to sync data from us. We are sorry for the change in behavior. -A [0] The repos available are the same repos; so it's not a security problem; just a problem of load management; we want users to sync from the edges of our network, not from the core.