diff --git a/nix/os/devices/steveej-x13s/configuration.nix b/nix/os/devices/steveej-x13s/configuration.nix
index 5a1817a..585c02e 100644
--- a/nix/os/devices/steveej-x13s/configuration.nix
+++ b/nix/os/devices/steveej-x13s/configuration.nix
@@ -96,6 +96,11 @@
       networking.firewall.interfaces."en+".allowedUDPPorts = udp;
       networking.firewall.interfaces."wl+".allowedTCPPorts = tcp;
       networking.firewall.interfaces."wl+".allowedUDPPorts = udp;
+
+      networking.firewall.allowedTCPPorts = [
+        # iperf3
+        5201
+      ];
     })
 
     ../../snippets/home-manager-with-zsh.nix