WordPress HTTPS issue (Flexible SSL – Cloudflare)

I use Flexible SSL via Cloudflare.

I edited my wp-config.php with:

if (strpos($_SERVER['HTTP_X_FORWARDED_PROTO'], 'https') !== false) {
    $_SERVER['HTTPS'] = 'on';
}

and
define('FORCE_SSL_ADMIN', true);

Everything was fine till I decided to update my WordPress Multisite. I did it with succeed, but after starting Upgrade Network I received an error:

Warning! Problem updating https://example.com. Your server may not be able to connect to sites running on it. Error message: stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages: error:14077410:SSL routines:func(119):reason(1040) stream_socket_client(): Failed to enable crypto stream_socket_client(): unable to connect to ssl://example.com:443 (Unknown error)

I had to disable SSL and run upgrade from HTTP.

How to fix this in future?

• This topic was modified 5 years, 8 months ago by spello.
• This topic was modified 5 years, 8 months ago by spello.