latest centminmod + cloudflare site doesn't work on some iOS devices

Hi,
I recently installed centminmod and enabled some modules (redis , memcached , opcache).
My website works fine on all devices except some iOS 11 devices.

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I'm using centminmod 123.09beta01
PHP 7.0
nginx 1.15.2 + ngx_pagespeed enabled
mariadb 10.1.34
and latest redis + memcached
cloudflare free CDN
and HTTP/2 is enabled by default on cloudflare
Wordpress + W3 Total Cache installed

here's the website : زوم فور کار مرجع خرید و فروش و اطلاعات خودرو| زوم فور کار
I don't have access to iOS device but some of my clients have and they reported this problem.

If you need more details please tell me. sorry if anything is wrong in my topic. I'm new here.

 

Tested SSL it's A+

They have tested all major browsers like Safari , Chrome and Firefox. none of them can access website.
older iOS version can see website.

Exactly! I don't have iOS device and I can't test it. this is driving me crazy!

 

centminmod.com
with 3G: Yes
with Wifi: No

cloudflare 3G and Wifi Yes

 

I think something is wrong with nginx + cloudflare configurations.

I asked one of clients to change their dns server to 8.8.8.8 and 4.2.2.4 yesterday and they accessed main page of website but other pages didn't work.

It's really wierd.

 

I checked my cloudflare account there is no blocked ip there. but I don't think that is the problem. because clients checked from different ISPs and different IPs. IP of most DSL users here is dynamic (IP changes when they disconnect/connect internet)

asked one of clients he can access website with VPN.

 

All of them use default ISP dns which is not 1.1.1.1.
each one of them have different ISP. like SabaNet, ParsOnline, Shatel.

 

i think cloudflare blocked their IP range. I asked him to open another website (which enabled cloudflare but doesn't have centminmod) and he can't access that website.
what can I do if cloudflare blocked all IP range?
and another wierd question. he can access website with the same IP Address on Windows and Android devices. why this only happens on iOS?

 

problem solved after disabling SSL.
It works here with VPN too. it's (Cloudflare SSL + iOS 11 + IP Range) problem (all of them together) if you change one of these 3 things it will work.