diff --git a/hosts/dnsc-server/default.nix b/hosts/dnsc-server/default.nix
index 41300f1..8eebf0c 100644
--- a/hosts/dnsc-server/default.nix
+++ b/hosts/dnsc-server/default.nix
@@ -57,7 +57,15 @@
   systemd.services.NetworkManager-wait-online.enable = false;
 
   # Firewall
-  networking.firewall.enable = true;
+  networking.firewall = {
+    enable = true;
+    allowedTCPPorts = [
+      9002 # Actual
+    ];
+    allowedUDPPorts = [
+      9002 # Actual
+    ];
+  };
 
   # My user account
   users.users.dennis = {