Postman API Error "Error: invalid_client, Description: Client authentication failed"

Hi,
Greetings !!

I am trying to make an API connection to my self- hosted DOCKER Installation and getting the below error in Postman while connecting “Error: invalid_client, Description: Client authentication failed”

This is my error Log from debug Mode:

|14281|15b8aa5|2023-12-15 06:31|AUTH|POST|DEBUG||/api/authorize/access_token|#0 /var/www/cms/vendor/league/oauth2-server/src/Grant/ClientCredentialsGrant.php(41): League\OAuth2\Server\Exception\OAuthServerException::invalidClient() #1 /var/www/cms/vendor/league/oauth2-server/src/AuthorizationServer.php(204): League\OAuth2\Server\Grant\ClientCredentialsGrant->respondToAccessTokenRequest() #2 /var/www/cms/web/api/authorize/index.php(104): League\OAuth2\Server\AuthorizationServer->respondToAccessTokenRequest() #3 [internal function]: {closure}() #4 /var/www/cms/vendor/php-di/invoker/src/Invoker.php(82): call_user_func_array() #5 /var/www/cms/vendor/php-di/slim-bridge/src/ControllerInvoker.php(47): Invoker\Invoker->call() #6 /var/www/cms/vendor/slim/slim/Slim/Routing/Route.php(384): DI\Bridge\Slim\ControllerInvoker->__invoke() #7 /var/www/cms/vendor/slim/slim/Slim/MiddlewareDispatcher.php(81): Slim\Routing\Route->handle() #8 /var/www/cms/vendor/slim/slim/Slim/MiddlewareDispatcher.php(81): Slim\MiddlewareDispatcher->handle() #9 /var/www/cms/vendor/slim/slim/Slim/Routing/Route.php(341): Slim\MiddlewareDispatcher->handle() #10 /var/www/cms/vendor/slim/slim/Slim/Routing/RouteRunner.php(84): Slim\Routing\Route->run() #11 /var/www/cms/lib/Middleware/ApiAuthentication.php(112): Slim\Routing\RouteRunner->handle() #12 /var/www/cms/vendor/slim/slim/Slim/MiddlewareDispatcher.php(147): Xibo\Middleware\ApiAuthentication->process() #13 /var/www/cms/lib/Middleware/State.php(88): class@anonymous->handle() #14 /var/www/cms/vendor/slim/slim/Slim/MiddlewareDispatcher.php(147): Xibo\Middleware\State->process() #15 /var/www/cms/lib/Middleware/Log.php(59): class@anonymous->handle() #16 /var/www/cms/vendor/slim/slim/Slim/MiddlewareDispatcher.php(147): Xibo\Middleware\Log->process() #17 /var/www/cms/lib/Middleware/Storage.php(61): class@anonymous->handle() #18 /var/www/cms/vendor/slim/slim/Slim/MiddlewareDispatcher.php(147): Xibo\Middleware\Storage->process() #19 /var/www/cms/vendor/slim/slim/Slim/Middleware/RoutingMiddleware.php(59): class@anonymous->handle() #20 /var/www/cms/vendor/slim/slim/Slim/MiddlewareDispatcher.php(147): Slim\Middleware\RoutingMiddleware->process() #21 /var/www/cms/lib/Middleware/TrailingSlashMiddleware.php(68): class@anonymous->handle() #22 /var/www/cms/vendor/slim/slim/Slim/MiddlewareDispatcher.php(147): Xibo\Middleware\TrailingSlashMiddleware->process() #23 /var/www/cms/vendor/slim/slim/Slim/Middleware/ErrorMiddleware.php(107): class@anonymous->handle() #24 /var/www/cms/vendor/slim/slim/Slim/MiddlewareDispatcher.php(147): Slim\Middleware\ErrorMiddleware->process() #25 /var/www/cms/vendor/slim/slim/Slim/MiddlewareDispatcher.php(81): class@anonymous->handle() #26 /var/www/cms/vendor/slim/slim/Slim/App.php(215): Slim\MiddlewareDispatcher->handle() #27 /var/www/cms/vendor/slim/slim/Slim/App.php(199): Slim\App->handle() #28 /var/www/cms/web/api/authorize/index.php(108): Slim\App->run() #29 {main}|

CMS Application Settings:


Please support in getting the connection to the CMS.

I am stuck in this for last 2 days. I have gone through multiple posts in community, but not able to fix the error.

Regards,
Mukul

Any help would be greatly appreciated.

Hi !

Are you still encountering this issue ? If so, have you tried checking the “Is Confidential” box ?

Regards,
Erin

1 Like

I have the same problem with version 4.0.6. Any help would be greatly appreciated.