Can someone please confirm that the cli-way of the solution (of this post) is the following command?
firewall-cmd --permanent --zone=FedoraWorkstation --add-service=gre
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Opening a file that is more than a year old is discouraged.
I moved your topic to a new thread.
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That command matches the marked solution in your original topic.
Omit the zone option to make it work for the default zone.
Remember to reload the config to apply the changes:
sudo firewall-cmd --reload
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Added pptp