Benutzer Registrierung

[Sizoberz]

Seit dem update von 4.4.12 auf 4.5.10 funktioniert die Benutzerregistrierung nicht mehr. Die Prüfung auf vorhandene Einträge funktioniert.
Eintrag im Log:

[2018-07-04 06:48:41] request.INFO: Matched route "contao_catch_all". {"route":"contao_catch_all","route_parameters":{"_scope":"frontend","_token_check":true,"_controller":"Contao\\CoreBundle\\Controller\\FrontendController::indexAction","_url_fragment":"files/images/higr_quer_1920x1080_FullHD_RGB.jpg","_route":"contao_catch_all"},"request_uri":"http://XXX.de/files/images/higr_quer_1920x1080_FullHD_RGB.jpg","method":"HEAD"} []
[2018-07-04 06:48:41] security.INFO: Populated the TokenStorage with an anonymous Token. [] []
[2018-07-04 06:48:41] request.INFO: Matched route "contao_catch_all". {"route":"contao_catch_all","route_parameters":{"_scope":"frontend","_token_check":true,"_controller":"Contao\\CoreBundle\\Controller\\FrontendController::indexAction","_url_fragment":"files/images/higr_quer_1920x1080_FullHD_RGB.jpg","_route":"contao_catch_all"},"request_uri":"http://XXX.de/files/images/higr_quer_1920x1080_FullHD_RGB.jpg","method":"GET"} []
[2018-07-04 06:48:41] security.INFO: Populated the TokenStorage with an anonymous Token. [] []
[2018-07-04 06:48:41] request.ERROR: Uncaught PHP Exception Symfony\Component\HttpKernel\Exception\NotFoundHttpException: "Page not found: http://XXX.de/files/images/higr_quer_1920x1080_FullHD_RGB.jpg" at /XXX/vendor/contao/core-bundle/src/EventListener/ExceptionConverterListener.php line 109 {"exception":"[object] (Symfony\\Component\\HttpKernel\\Exception\\NotFoundHttpException(code: 0): Page not found: http://XXX.de/files/images/higr_quer_1920x1080_FullHD_RGB.jpg at /XXX/vendor/contao/core-bundle/src/EventListener/ExceptionConverterListener.php:109, Contao\\CoreBundle\\Exception\\PageNotFoundException(code: 0): Page not found: http://XXX.de/files/images/higr_quer_1920x1080_FullHD_RGB.jpg at /XXX/vendor/contao/core-bundle/src/Resources/contao/controllers/FrontendIndex.php:64)"} []
[2018-07-04 06:48:43] request.INFO: Matched route "contao_catch_all". {"route":"contao_catch_all","route_parameters":{"_scope":"frontend","_token_check":true,"_controller":"Contao\\CoreBundle\\Controller\\FrontendController::indexAction","_url_fragment":"files/images/higr_quer_1920x1080_FullHD_RGB.jpg","_route":"contao_catch_all"},"request_uri":"http://XXX.de/files/images/higr_quer_1920x1080_FullHD_RGB.jpg","method":"HEAD"} []
[2018-07-04 06:48:43] security.INFO: Populated the TokenStorage with an anonymous Token. [] []
[2018-07-04 06:48:43] request.INFO: Matched route "contao_catch_all". {"route":"contao_catch_all","route_parameters":{"_scope":"frontend","_token_check":true,"_controller":"Contao\\CoreBundle\\Controller\\FrontendController::indexAction","_url_fragment":"files/images/higr_quer_1920x1080_FullHD_RGB.jpg","_route":"contao_catch_all"},"request_uri":"http://XXX.de/files/images/higr_quer_1920x1080_FullHD_RGB.jpg","method":"GET"} []
[2018-07-04 06:48:43] security.INFO: Populated the TokenStorage with an anonymous Token. [] []
[2018-07-04 06:48:43] request.ERROR: Uncaught PHP Exception Symfony\Component\HttpKernel\Exception\NotFoundHttpException: "Page not found: http://XXX.de/files/images/higr_quer_1920x1080_FullHD_RGB.jpg" at /XXX/vendor/contao/core-bundle/src/EventListener/ExceptionConverterListener.php line 109 {"exception":"[object] (Symfony\\Component\\HttpKernel\\Exception\\NotFoundHttpException(code: 0): Page not found: http://XXX.de/files/images/higr_quer_1920x1080_FullHD_RGB.jpg at /XXX/vendor/contao/core-bundle/src/EventListener/ExceptionConverterListener.php:109, Contao\\CoreBundle\\Exception\\PageNotFoundException(code: 0): Page not found: http://XXX.de/files/images/higr_quer_1920x1080_FullHD_RGB.jpg at /XXX/vendor/contao/core-bundle/src/Resources/contao/controllers/FrontendIndex.php:64)"} []
[2018-07-04 06:48:52] request.INFO: Matched route "contao_frontend". {"route":"contao_frontend","route_parameters":{"_token_check":true,"_controller":"Contao\\CoreBundle\\Controller\\FrontendController::indexAction","_scope":"frontend","alias":"registrierung","_route":"contao_frontend"},"request_uri":"http://XXX.de/registrierung.html","method":"POST"} []
[2018-07-04 06:48:52] security.INFO: Populated the TokenStorage with an anonymous Token. [] []
[2018-07-04 06:48:53] app.CRITICAL: An exception occurred. {"exception":"[object] (Swift_TransportException(code: 0): Expected response code 220 but got code \"\", with message \"\" at /XXX/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:445)"} []