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The warning text is adapted from https://tailscale.com/kb/1028/key-expiry#renewing-keys-for-an-expired-device . There is already https://github.com/tailscale/tailscale/pull/7575 which presents a warning when connected over Tailscale, however the detection is done by checking SSH environment variables, which are absent within systemd's run0*. That means `--force-reauth` will happily bring down Tailscale connection, leaving the user in despair. Changing only the help text is by no means a complete solution, but hopefully it will stop users from blindly trying it out, and motivate them to search for a proper solution. *: https://www.freedesktop.org/software/systemd/man/devel/run0.html Updates #3849 Signed-off-by: yejingchen <ye.jingchen@gmail.com>