Subdomain don't open

[lenglishl.com]

hi.
I added my main domain (www.lenglishl.com) to cloudflare and I set DNS. everything is OK and my main domain open but my subdomain (forum.lenglishl.com) don’t open.

[sandro]

It is not just the forum, your entire site does not load

Community Tip - Fixing Error 523: Origin is unreachable

Error Try the suggestions in this Community Tip to help you fix “Error 523: Origin is unreachable”. Background Error 523 indicates that there is an issue in the origin web server and it has become unreachable. The most common cause is that your DNS settings are incorrect. When this happens, you’ll see “Error 523: Origin is unreachable”. Quick Fix Ideas Note that if Always Online is enabled, this status code will trigger an Always Online page to be served. Contact your hosting provider …

[lenglishl.com]

well, what can i do? what is problem?

[sandro]

Well, I posted the link for a reason. How come it didnt help?

[lenglishl.com]

thanks for reply to me.
I Contact my hosting provider to confirm my origin IP.

[lenglishl.com]

By the way, I can’t log in to the host (Cpanel)

[sandro]

These are all things you need to clarify with your host I am afraid.