The iptables rules must be unloaded. If using Qubes, disable qubes-iptables and qubes-firewall systemd services. Non-Qubes users can skip this. <pre> sudo systemctl mask qubes-iptables sudo systemctl stop qubes-iptables sudo systemctl mask qubes-firewall sudo systemctl stop qubes-firewall </pre> {{Open File|filename=~/fw-unload}} Add. {{Firewall_Unload}} Save. Make ~/fw-unload executable. <pre> chmod +x ~/fw-unload </pre> Unload all iptables firewall rules. <pre> sudo ~/fw-unload </pre> After firewall unload, run the following command to see if all firewall rules are really unloaded. <pre> sudo iptables-save | sed -e 's/\[[0-9:]*\]/[0,0]/' -e '/^#/d' </pre> The output should show. <pre> *mangle :PREROUTING ACCEPT [0,0] :INPUT ACCEPT [0,0] :FORWARD ACCEPT [0,0] :OUTPUT ACCEPT [0,0] :POSTROUTING ACCEPT [0,0] COMMIT *raw :PREROUTING ACCEPT [0,0] :OUTPUT ACCEPT [0,0] COMMIT *nat :PREROUTING ACCEPT [0,0] :INPUT ACCEPT [0,0] :OUTPUT ACCEPT [0,0] :POSTROUTING ACCEPT [0,0] COMMIT *filter :INPUT ACCEPT [0,0] :FORWARD ACCEPT [0,0] :OUTPUT ACCEPT [0,0] COMMIT </pre>