How can I detect which setting in the OS X could block ping localhost?
IPFW, LittleSnitch no such rules?
Update 1:
> cat /etc/hosts
127.0.0.1 localhost
255.255.255.255 broadcast
MacOS – Which setting in osx could block “ping localhost”
ipfwmacosNetworkping
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Best Answer
The obvious choice would be if stealth mode were on. That blocks pings to localhost on all my Mac OS systems. Go to System Preferences, Security & Privacy, Firewall, Firewall Options...
Also, if you have "Block all incoming connections" that might also affect things. I would certainly turn off LittleSnitch since it also can and will block that sort of traffic if you haven't allowed it.