diff --git a/configuration.nix b/configuration.nix
index 5587292..d446705 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -177,7 +177,7 @@
   security.acme.acceptTerms = true;
   security.acme.defaults.email = "cert@stura.htw-dresden.de";
 
-  networking.firewall.allowedTCPPorts = [ 25 80 443 597 9000 ];
+  networking.firewall.allowedTCPPorts = [ 25 80 443 597 ];
 
   system.stateVersion = "24.11";