Lately, there have been a string of networking problems with Mac OS X 10.5 Leopard reported by sites such as MacFixIt. One of most common symptoms is the loss of Bonjour’s “.local” addresses. So, for instance, if you have a machine named “Perseus” then you could address that machine by the hostname “Perseus.local” instead of its IP address.
However, if you find that the .local host name no longer works but the IP address still does, the problem may be in a corrupt or outdated local DNS cache. Luckily, the solution is incredibly simple. Just run:
at a Terminal prompt, and try again. If you’re still running Mac OS X 10.4 Tiger and you experience this problem, the solution is just as simple. Instead of the above line, simply run:
at a Terminal prompt.