some reverse proxy tweaks

resources/mainsail_nginx.cfg

@@ -10,8 +10,8 @@ upstream apiserver {
 }
 
 server {
-    listen 80 default_server;
-    listen [::]:80 default_server;
+    listen 80;
+    #listen [::]:80; # no ipv6 support in mainsail yet!
 
     access_log /var/log/nginx/mainsail-access.log;
     error_log /var/log/nginx/mainsail-error.log;