diff --git a/hosts/server/configuration.nix b/hosts/server/configuration.nix
index 6614ebe..04f1c08 100644
--- a/hosts/server/configuration.nix
+++ b/hosts/server/configuration.nix
@@ -130,8 +130,8 @@
   };
 
   # Open ports in the firewall.
-  # networking.firewall.allowedTCPPorts = [ ... ];
-  # networking.firewall.allowedUDPPorts = [ ... ];
+  networking.firewall.allowedTCPPorts = [ 22 ];
+  networking.firewall.allowedUDPPorts = [ 22 ];
   # Or disable the firewall altogether.
   # networking.firewall.enable = false;