I'm following the instruction, on hardentheworld.org to harden my OS X 10.11.

When I send the following command:

sudo defaults write /System/Library/LaunchDaemons/com.apple.mDNSResponder ProgramArguments -array-add "-NoMulticastAdvertisements"

I obtain:

Could not write /System/Library/LaunchDaemons/com.apple.mDNSResponder; exiting

My question is why this error happens and how to solve it?


System Integrity Protection (SIP.) It locks up a variety of files to prevent malicious software from modifying it including /System. You can temporarily disable SIP, modify your files, then turn it back on if you want to have the maximum protection.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .