After some time ssh to local servers doesnt work anymore. Example: ssh localserver name <— doesnt work ssh localserver IP <— works Solution: In Terminal type; sudo killall mDNSResponder Google helps me: URL: http://www.mac-forums.com/forums/os-x-operating-system/164649-snow-leopard-keeps-dropping-dns.html URL1: http://discussions.apple.com/message.jspa?messageID=10090153#10090153