Recently I was performing a little hardening of my Qubes and came accross this strange command in the Time Synchronization hardening manual. The thing is that this command firewall_mode= has no value after equal sign. Should it really be like this or this is an error in the manual? Then what value actually should be after “=”? And what consequences can be if a user adds this line in the form it is now? Because I did. 
And I already noticed some changes in sdwdate log. Don’t know and not saying that they signal anything bad, just saying there are some changes.
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Documentation was OK as is. Added a footnote just now to clarify, explain.
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