How do I restrict access to /admin?

Help with Setup/Upgrade
1

I want to restrict access to the control panel interface to the IP address range of my ISP. At least, that seems like a sensible thing to do in terms of security. How do I do that on v76?

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2

There’s no built in thing. But you could hack the nginx configuration to block access to /admin in this way (I don’t know how though)
Note such a change would probably be overwritten by a nightly script, so that has to be taken into account as well.