diff --git a/modules/hosts/robin/configuration.nix b/modules/hosts/robin/configuration.nix
index 1f88c5d..4b601ae 100644
--- a/modules/hosts/robin/configuration.nix
+++ b/modules/hosts/robin/configuration.nix
@@ -95,6 +95,7 @@
         
         # --- K3s Agent Ports ---
         10250  # Kubelet API (Required for master node logs/metrics/exec)
+        9100  # Prometheus Node Exporter
       ];
       
       allowedUDPPorts = [