diff --git a/modules/web/hyperilo.nix b/modules/web/hyperilo.nix
index 83fcb11..a9cd8f0 100644
--- a/modules/web/hyperilo.nix
+++ b/modules/web/hyperilo.nix
@@ -9,9 +9,20 @@
     locations."/".basicAuthFile = "/run/secrets/hyperilo_htaccess";
     locations."/".extraConfig = ''
       proxy_ssl_verify off;
+      proxy_http_version 1.1;
+      proxy_set_header Upgrade $http_upgrade;
+      proxy_set_header Connection $connection_upgrade;
     '';
   };
 
+  # HP iLO requires uppercase Upgrade, not lowercase "upgrade"
+  services.nginx.commonHttpConfig = ''
+     map $http_upgrade $connection_upgrade_capitalized {
+       default  Upgrade;
+       '''      close;
+     }
+  '';
+
   systemd.network.networks."20-hyperilo" = {
     matchConfig.Name = "eno8303";
     address = [ "192.168.0.1/24" ];