Fleet standalone redirect fix

salt/nginx/etc/nginx.conf

@@ -98,7 +98,7 @@ http {
 	{%- if role == 'fleet' %}
 	server {
 		listen       443 ssl http2;
-		server_name  {{ url_base }};
+		server_name  {{ main_ip }};
 		root         /opt/socore/html;
 		index        index.html;