"Could not write domain"

[osxadmin]

Hi I'm trying to reduce the multicast DNS timeout by editing mdns_timeout, but when I do that I get:

2017-03-17 13:42:04.643 defaults[1706:22397] Could not write domain /System/Library/SystemConfiguration/IPMonitor.bundle/Contents/Info.plist; exiting

thank you for your help

[StoneMagnet · Accepted solution]

@osxadmin You aren't going to be able to modify that .plist on 10.11 or later due to Apple's System Integrity Protection. See the following for more info:

About System Integrity Protection on your Mac

System Integrity Protection – Adding another layer to Apple’s security model

[osxadmin]

@StoneMagnet got it, thank you.

(ps: I'm on 10.12.3)