diff --git a/configuration.nix b/configuration.nix
index 946fb1e..ffc1587 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -56,11 +56,9 @@
   services.openssh.enable = true;
   services.openssh.permitRootLogin = "no";
 
-  # Open ports in the firewall.
-  # networking.firewall.allowedTCPPorts = [ ... ];
-  # networking.firewall.allowedUDPPorts = [ ... ];
-  # Or disable the firewall altogether.
-  # networking.firewall.enable = false;
+  networking.firewall.allowedTCPPorts = [  ];
+  networking.firewall.allowedUDPPorts = [  ];
+  networking.firewall.enable = true;
 
   security.sudo.wheelNeedsPassword = false;