For a period of time Bonjour has stopped working on my laptop - but it did not become a problem until I needed to add a new printer. So I hunted around for a fix - and found this :

sudo launchctl unload /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

sudo launchctl load /System/Library/LaunchDaemons/com.apple.mDNSResponder.plist

which seems to have fixed it for me.

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