diff --git a/configuration.nix b/configuration.nix
index 7ddcf5a..f134461 100755
--- a/configuration.nix
+++ b/configuration.nix
@@ -87,11 +87,12 @@
   services.openssh.enable = true;
   services.openssh.settings.PasswordAuthentication = false;
 
+  networking.firewall.enable = true;
   # Open ports in the firewall.
-  # networking.firewall.allowedTCPPorts = [ ... ];
+  networking.firewall.allowedTCPPorts = [ 
+    1972 # SSH
+  ];
   # networking.firewall.allowedUDPPorts = [ ... ];
-  # Or disable the firewall altogether.
-  # networking.firewall.enable = false;
 
   # Copy the NixOS configuration file and link it from the resulting system
   # (/run/current-system/configuration.nix). This is useful in case you