diff --git a/sulu/sulu-builder/Makefile b/sulu/sulu-builder/Makefile
index 2e513f88f..90f002de4 100644
--- a/sulu/sulu-builder/Makefile
+++ b/sulu/sulu-builder/Makefile
@@ -98,8 +98,12 @@ define Package/sulu/install/Default
 	$(INSTALL_DIR) $(1)/sulu/
 	$(INSTALL_DIR) $(1)/etc/sulu
 
+	$(INSTALL_DATA) ./files/maintenance.html $(1)/sulu/
+	$(LN) /tmp/sulu $(1)/sulu/connection
+
 	$(INSTALL_BIN) ./files/etc/sulu/sulu.sh $(1)/etc/sulu/
 	$(INSTALL_DATA) ./files/etc/sulu/nginx.locations $(1)/etc/sulu/
+	$(INSTALL_BIN) ./files/etc/sulu/sulu_watcher.sh $(1)/etc/sulu/
 
 	$(INSTALL_DIR) $(1)/etc/users/roles
 	$(INSTALL_DATA) ./files/etc/users/roles/*.json $(1)/etc/users/roles/
@@ -109,6 +113,8 @@ define Package/sulu/install/Default
 ifneq ($(CONFIG_SULU_DEFAULT_UI)$(CONFIG_SULU_BUILDER_DEFAULT_UI),)
 	$(INSTALL_DATA) ./files/etc/uci-defaults/41-make-sulu-default-ui $(1)/etc/uci-defaults/
 endif
+	$(INSTALL_DIR) $(1)/etc/init.d
+	$(INSTALL_BIN) ./files/etc/init.d/sulu $(1)/etc/init.d/
 endef
 
 define Package/sulu/install/Post
diff --git a/sulu/sulu-builder/files/etc/init.d/sulu b/sulu/sulu-builder/files/etc/init.d/sulu
new file mode 100644
index 000000000..e1fa47ff0
--- /dev/null
+++ b/sulu/sulu-builder/files/etc/init.d/sulu
@@ -0,0 +1,15 @@
+#!/bin/sh /etc/rc.common
+
+START=9
+STOP=01
+
+USE_PROCD=1
+
+PROG=/etc/sulu/sulu_watcher.sh
+
+start_service()
+{
+	procd_open_instance "sulu"
+	procd_set_param command ${PROG}
+	procd_close_instance "sulu"
+}
diff --git a/sulu/sulu-builder/files/etc/sulu/nginx.locations b/sulu/sulu-builder/files/etc/sulu/nginx.locations
index af48faf69..4b5452cd7 100644
--- a/sulu/sulu-builder/files/etc/sulu/nginx.locations
+++ b/sulu/sulu-builder/files/etc/sulu/nginx.locations
@@ -8,6 +8,10 @@ location /sitemap.xml {
 	return 200 "User-agent: *\nDisallow: /\n";
 }
 
+location /maintenance.html {
+	internal;
+}
+
 location /wss {
 	proxy_pass_request_headers      on;
 	proxy_cache        off;
@@ -46,7 +50,10 @@ location / {
 		add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,Content-Type,Range' always;
 		add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;
 	}
-	add_header Cache-Control 'no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0';
-	add_header Pragma 'no-cache';
+
+	if (!-f $document_root/connection/ready) {
+		return 503;
+	}
+
 	expires 0;
 }
diff --git a/sulu/sulu-builder/files/etc/sulu/sulu_watcher.sh b/sulu/sulu-builder/files/etc/sulu/sulu_watcher.sh
new file mode 100644
index 000000000..7152a6785
--- /dev/null
+++ b/sulu/sulu-builder/files/etc/sulu/sulu_watcher.sh
@@ -0,0 +1,29 @@
+#!/bin/sh
+
+if ! command -v obuspa >/dev/null 2>&1; then
+	exit 0
+fi
+
+USP_PATH="/tmp/sulu/"
+
+log() {
+	logger -t sulu_watcher "$*"
+}
+
+wait_for_obuspa() {
+	while true; do
+		ENDPOINTID="$(obuspa -c get Device.LocalAgent.EndpointID |grep Device.|awk '{print $3}')"
+		sleep 2
+		if [ -n "${ENDPOINTID}" ]; then
+			break;
+		fi
+	done
+}
+
+mark_usp_ready() {
+	mkdir -p "${USP_PATH}"
+	touch ${USP_PATH}/ready
+}
+
+wait_for_obuspa
+mark_usp_ready
diff --git a/sulu/sulu-builder/files/etc/uci-defaults/40-add-sulu-config b/sulu/sulu-builder/files/etc/uci-defaults/40-add-sulu-config
index 5ede27fc9..641e6ca93 100644
--- a/sulu/sulu-builder/files/etc/uci-defaults/40-add-sulu-config
+++ b/sulu/sulu-builder/files/etc/uci-defaults/40-add-sulu-config
@@ -51,6 +51,7 @@ add_sulu_userinterface_uci()
 		uci_set userinterface _sulu_s _nginx_ssl_certificate '/etc/nginx/conf.d/_lan.crt'
 		uci_set userinterface _sulu_s _nginx_ssl_certificate_key '/etc/nginx/conf.d/_lan.key'
 		uci_set userinterface _sulu_s _nginx_ssl_session_cache 'none'
+		uci_set userinterface _sulu_s _nginx_error_page '503 /maintenance.html'
 		uci_set userinterface _sulu_s protocol 'HTTPS'
 		uci_add_list userinterface _sulu_s role 'admin'
 		uci_add_list userinterface _sulu_s role 'user'
diff --git a/sulu/sulu-builder/files/maintenance.html b/sulu/sulu-builder/files/maintenance.html
new file mode 100644
index 000000000..0463d0cc8
--- /dev/null
+++ b/sulu/sulu-builder/files/maintenance.html
@@ -0,0 +1,17 @@
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Service Unavailable</title>
+    <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate">
+    <meta http-equiv="Pragma" content="no-cache">
+    <meta http-equiv="Expires" content="0">
+</head>
+<body style="text-align: center; font-family: sans-serif; padding-top: 50px;">
+    <h1>503 Service Unavailable</h1>
+    <p>Sulu backend not ready yet</p>
+    <p>We apologize for the inconvenience and appreciate your patience.</p>
+    <hr style="width: 50%;">
+    <p>Please refresh the page to check again.</p>
+</body>
+</html>