Re: Unable to display static content on same server

(a)internet -> (b)firewall -> (c)netscaler -> (d)machine-with-nginx.

If accessing (d) works for both http and https then the config is ok.
If accessing (d) via (a) does not work you should obviously now see the problem can be at a,b and/or c.
Also check if (d) doesn't have a firewall actively blocking anything from outside (d).