Hetzner specifically prohibit the use of file sharing services (see the service agreement for root servers: (http://www.hetzner.de/en/hosting/legal/system-polic

Hetzner specifically prohibit the use of file sharing services (see the service agreement for root servers: (http://www.hetzner.de/en/hosting/legal/system-policies-rs http://www.hetzner.de/en/hosting/legal/system-policies-rs). Not sure if it's still the case, but they also used to have a policy of blocking port 6667.