firewall-cmd --direct --add-rule ipv4 filter INPUT 0 -p gre -j ACCEPT
firewall-cmd --direct --add-rule ipv6 filter INPUT 0 -p gre -j ACCEPT
firewall-cmd --reload
Do this if you are experiencing connection failures... (source Ask Fedora)
5
30
2015
30
2015
Fedora VPN connection
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