Bad Request (#400) csrf issue

Hi no matter what i try i keep getting Bad Request on my front end application when i login. I have a setup where my backend is at admin.domain.com and front end is on domain.com. I have tried a simple config with just different cookieValidationKeys, this doesn’t work and i also have the following configs which works on my local computer but not my server, what am i doing wrong!

frontend




	'components' => [

		'request' => [

			// !!! insert a secret key in the following (if it is empty) - this is required by cookie validation

			'cookieValidationKey' => 'pOfS75nOJUW9cXxg-JdnaHtpW9npQdGys',

			'csrfParam' => '_csrf-frontend',

			'csrfCookie' => [

				'httpOnly' => true,

			],

		],

		'user' => [

			'identityClass' => 'common\models\User',

			'enableAutoLogin' => true,

			'identityCookie' => [

				'name' => '_identity-frontend',

				'httpOnly' => true,

			],

		],

		'session' => [

			// this is the name of the session cookie used for login on the backend

			'name' => 'advanced-frontend',

			'cookieParams' => [

				'httpOnly' => true,

				'path' => '/',

			],

		],

	],

Backend




'components' => [

		'request' => [

			// !!! insert a secret key in the following (if it is empty) - this is required by cookie validation

			'cookieValidationKey' => 'vDnre587vu-XAt_FOmc2K6qvwxxpa0Q0',

			'csrfParam' => '_backendCSRF',

			'csrfCookie' => [

				'httpOnly' => true,

			],

		],

		'user' => [

			'identityClass' => 'common\models\User',

			'enableAutoLogin' => true,

			'identityCookie' => [

				'name' => '_backendIdentity',

				'httpOnly' => true,

			],

		],

		'session' => [

			// this is the name of the session cookie used for login on the backend

			'name' => 'PHPBACKSESSID',

			'cookieParams' => [

				'httpOnly' => true,

				'path' => '/',

			],

		],

	],

Ok Found the issue, i have been changing the config files on the live server but i am running PHP7. I believe php7 caches code. I didn’t restart php7 and apache. After doing so everything seems to work. :)