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.
Without a license key, Little Snitch runs in demo mode, which provides the same protection and functionality as the full version. The demo runs for three hours, and it can be restarted as often as you like. The Network Monitor expires after 30 days. Turn it into a full version by entering a license key. Little Snitch 3.7 Multilingual macOS Sierra; has been made public on our website after successful testing. This tool will work great on MAC OS and WINDOWS OS platforms. And Latest mobile platforms Little Snitch 3.7 Multilingual macOS Sierra has based on open.
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.
macOS Sierra (10.12.6)
Little Snitch For Mac 10.12.6 Sierra Download
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