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Little Snitch, Sierra OS upgrade, & Network...

Recently tried to upgrade a Mac OS X Mini Server 2001 to Mac OS Sierra 10.12.6. 

Sierra OS software was installed and booted OK but could not get any network connection.  iCloud connection could not be reached and thus could not sign into iCloud to setup accounts upon reboot. 

I had Little Snitch 3.7 running prior to install and installed Sierra over it.  However, upon reboot after the Sierra upgrade, Little Snitch was not allowing any application to communicate with the internet.  Network diagnostics showed Wifi, Ethernet, and iPhone hotspot as having five green lights and making a successful internet connection.

After uninstalling Little Snitch and rebooting, internet access became available.

It may be wise to uninstall Little Snitch firewall prior to performing a major upgrade in OS X and then reinstall after. 

FWIW, the problem may also have been you weren't running Little Snitch 4. Personally I wouldn't install Little Snitch at all.

最后更新：2017-09-25 09:05:24

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