Love it or not, some environments insist on disabling Bonjour, Apple’s implementation of Multicast DNS. Despite the fact that mDNS has been around since 2000 and is widely used by Microsoft, we still look to disable this from time to time. As Arek Dreyer mentioned last week at MacSysAdmin in Gothenburg, Sweden, you can’t just disable the mDNSResponder LaunchDaemon or you will bork DNS (my word I think, not his). Instead, to disable Bonjour you would add the -NoMulticastAdvertisements option into the ProgramArguments array in the /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist file. This can be done manually, or it can be automated with the following command: defaults write /System/Library/LaunchDaemons/com.apple.mDNSResponder ProgramArguments -array “/usr/sbin/mDNSResponder” “-launchd” “-NoMulticastAdvertisements”…