One of my providers has a severe issue with their network. The DNS servers are not reachable. This causes 'page not found' errors for some subdomains of libranet .de because of failing DNS requests. Affected services: mailserver at libranet.de/mx10.libranet.de, xmpp server at libranet.de/chat.libranet.de, AP relay at relay.libranet.de.