JavaScript-Unable to access the server over HTTPS

Company mobile app through HTTPS access server, has been normal.
The server was upgraded yesterday, the Android app is all right after the upgrade, and iOS, including the previous normal version of the Apple Store on-line, is inaccessible.
Browser access to the website using HTTPS is also not open. Prompt for access denied. The three ends are normal when accessed via HTTP.

What could be the cause of this problem?

Reply content:

Company mobile app through HTTPS access server, has been normal.
The server was upgraded yesterday, the Android app is all right after the upgrade, and iOS, including the previous normal version of the Apple Store on-line, is inaccessible.
Browser access to the website using HTTPS is also not open. Prompt for access denied. The three ends are normal when accessed via HTTP.

What could be the cause of this problem?

What authority is the HTTPS certificate issued by? Is it out of date? Is it accessed through a domain name?

What information is available after clicking on the small lock? Upgrade server This is too much.

See what HTTP returns

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