diff --git a/deployment/check/common/targetNode.nix b/deployment/check/common/targetNode.nix
index 30299b0d..e3d0c40b 100644
--- a/deployment/check/common/targetNode.nix
+++ b/deployment/check/common/targetNode.nix
@@ -42,7 +42,10 @@ in
         settings.PermitRootLogin = "yes";
       };
 
-      networking.firewall.allowedTCPPorts = [ 22 ];
+      networking = {
+        firewall.enable = false;
+        enableIPv6 = false;
+      };
 
       ## Test VMs don't have a bootloader by default.
       boot.loader.grub.enable = false;