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On 5/23/2019 at 9:03 PM, Prestahost.cz said:

Hello,

there is described one of possible causes of invalid token together with the solution

it apply for specific server configuration but be sure to check your phpinfo for $_SERVER[‘HTTPS’]  variable anyway

This is THE solution!

if(isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https'){
    $_SERVER['HTTPS']='on';
}

Add this on your adminxxxxxxxxxxxxx/index.php top, just after <?php

There is NGINX on my server and $_SERVER are rewritten. There wasn't $_SERVER['HTTPS'] variable.