【１．管理画面にログインできない】ログです。
/log/site_yyyy-mm-dd.log

myapp.INFO: Matched route "eadmin_login_check". {"route_parameters":{"_controller":null,"_route":"eadmin_login_check"},"request_uri":"http://domain.com/eadmin/login_check"} []
myapp.INFO: Authentication request failed. {"exception":"[object] (Symfony\\Component\\Security\\Core\\Exception\\InvalidCsrfTokenException(code: 0): Invalid CSRF token. at /vendor/symfony/security/Http/Firewall/UsernamePasswordFormAuthenticationListener.php:82)"} []
myapp.INFO: < 302 http://domain.com/eadmin/login [] []
myapp.INFO: Matched route "admin_login". {"route_parameters":{"_controller":"\\Eccube\\Controller\\Admin\\AdminController::login","_route":"admin_login"},"request_uri":"http://domain.com/eadmin/login"} []
myapp.INFO: Populated the TokenStorage with an anonymous Token. [] []
myapp.INFO: > GET /eadmin/login [] []
myapp.INFO: < 200 [] []