Reload Whonix-Workstation Firewall.
If you are using Qubes-Whonix, complete the following steps:
Qubes App Launcher (blue/grey "Q") -> Whonix-Workstation AppVM (commonly named anon-whonix) -> Reload Whonix Firewall
If you are using a graphical Whonix-Workstation, complete the following steps:
Start Menu -> Applications -> System -> Reload Whonix Firewall
If you are using a terminal-only Whonix-Workstation, run: