Launch Terminal and type: ntpdate -u time.apple.com. Note: If you receive 'operation not permitted' put sudo in front of the command. Sudo ntpdate -u time.apple.com. Proceed normally. The problem is, SYSTEM DATE is wrong, and CERT validation is failing (https) First, ensure your Mac is connected to a wired or wireless network. Resurrecting this thread again. I had given up on Fing Desktop, but decided to try again when v2.0.0 was released. But still getting teh Fing service not found message, running macOS Catalina 10.15.5, no VPN service running. . If your Mac is using macOS Sierra or earlier, include the -applicationpath argument and installer path, similar to the way this is done in the command for El Capitan. After typing the command: Press Return to enter the command. When prompted, type your administrator password and press Return again.

Mounting volumes on macOS can be done using Disk Utility.app. For some reason, Apple decided not to show EFI partitions (among others such as Preboot, Recovery, etc) in Disk Utility.app. In this article, I will show you how to mount these volumes using command line (Terminal).

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Listing all volumes

To list all volumes (partitions), use diskutil list.

As you can see, there are 2 physical drives, both containing EFI partition.

If you compare it to Disk utility.app, it is rather brief.

Mounting a volume

To mount a volume, use sudo diskutil mount DiskIdentifier|DeviceNode|VolumeName.

This will mount the volume to /Volumes/<VolumeName>. If this mount point is already in use, a number will be added at the end (e.g: /Volumes/EFI 1).

The sudo command in the beginning is very import, omitting it causes error message like

Mounting a volume to specified mount point

You can mount a volume to a different mount point (directory) using -mountPoint option. Beware, target mount point must exist.

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Unmounting a volume

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Unmounting a volume is as easy as mounting a volume, use diskutil umount DiskIdentifier|DeviceNode|VolumeName.