FirewallD

$ sudo firewall-cmd --list-all
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: ens3
  sources: 
  services: cockpit dhcpv6-client http https smtp smtps
  ports: 3355/tcp
  protocols: 
  forward: no
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules: 

zde pro KdeConnect / GSConnect

$ sudo firewall-cmd [--permanent] --zone=FedoraWorkstation --add-port=1714-1764/tcp --add-port=1714-1764/udp

$ sudo firewall-cmd reload