On Friday (September 25, Japan Time) Security Update 2020-005 High Sierra (17G14033) came out. (I had NEVER seen the problem before that.) This was the situation with Security Update 2020-004. But then if my iMac sleeps and wakes up, the same thing would happen again. Then the Internet connection (Fiber-optic connection by a Japanese ISP) would come back. The only way to connect to the Internet was to open System Preferences, open Network pane, select ‘PPPoE’ from the sidebar, and then click the ‘Connect’ button. The PPPoE menubar icon shows the disconnected status, and if I use that menu and select the ‘connect PPPoE’ item, it tries to connect, but fails. After that, if my iMac sleeps and then wakes up, at first it works fine, but after a few minutes, Internet connection disconnects itself. The release note doesn’t say anything about it, but I observed the following change on my 2017 iMac 5K running macOS 10.13.6 High Sierra: Security Update 2020-005 High Sierra fixed a bad bug.
#Apple security update 10.13 how to
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