A problem

Error	richdocuments	GuzzleHttp\Exception\RequestException: cURL error 56: Recv failure: Connection reset by peer

    /var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/RequestFsm.php - line 103: GuzzleHttp\Exception\RequestException wrapException(Object(GuzzleHttp\Message\Request), Object(GuzzleHttp\Ring\Exception\RingException))
    /var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/RequestFsm.php - line 132: GuzzleHttp\RequestFsm->__invoke(Object(GuzzleHttp\Transaction))
    /var/www/html/nextcloud/3rdparty/react/promise/src/FulfilledPromise.php - line 25: GuzzleHttp\RequestFsm->GuzzleHttp\{closure}(Array)
    /var/www/html/nextcloud/3rdparty/guzzlehttp/ringphp/src/Future/CompletedFutureValue.php - line 55: React\Promise\FulfilledPromise->then(Object(Closure), NULL, NULL)
    /var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Message/FutureResponse.php - line 43: GuzzleHttp\Ring\Future\CompletedFutureValue->then(Object(Closure), NULL, NULL)
    /var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/RequestFsm.php - line 134: GuzzleHttp\Message\FutureResponse proxy(Object(GuzzleHttp\Ring\Future\CompletedFutureArray), Object(Closure))
    /var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php - line 165: GuzzleHttp\RequestFsm->__invoke(Object(GuzzleHttp\Transaction))
    /var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php - line 125: GuzzleHttp\Client->send(Object(GuzzleHttp\Message\Request))
    /var/www/html/nextcloud/lib/private/Http/Client/Client.php - line 138: GuzzleHttp\Client->get('http //127.0.0....', Array)
    /var/www/html/nextcloud/apps/richdocuments/lib/WOPI/DiscoveryManager.php - line 84: OC\Http\Client\Client->get('http //127.0.0....')
    /var/www/html/nextcloud/apps/richdocuments/lib/WOPI/Parser.php - line 41: OCA\Richdocuments\WOPI\DiscoveryManager->get()
    /var/www/html/nextcloud/apps/richdocuments/lib/TokenManager.php - line 122: OCA\Richdocuments\WOPI\Parser->getUrlSrc('application/vnd...')
    /var/www/html/nextcloud/apps/richdocuments/lib/Controller/DocumentController.php - line 168: OCA\Richdocuments\TokenManager->getToken(*** sensitive parameters replaced ***)
    [internal function] OCA\Richdocuments\Controller\DocumentController->index('146')
    /var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 160: call_user_func_array(Array, Array)
    /var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 90: OC\AppFramework\Http\Dispatcher->executeController(Object(OCA\Richdocuments\Controller\DocumentController), 'index')
    /var/www/html/nextcloud/lib/private/AppFramework/App.php - line 114: OC\AppFramework\Http\Dispatcher->dispatch(Object(OCA\Richdocuments\Controller\DocumentController), 'index')
    /var/www/html/nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47: OC\AppFramework\App main('OCA\\Richdocumen...', 'index', Object(OC\AppFramework\DependencyInjection\DIContainer), Array)
    [internal function] OC\AppFramework\Routing\RouteActionHandler->__invoke(Array)
    /var/www/html/nextcloud/lib/private/Route/Router.php - line 299: call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array)
    /var/www/html/nextcloud/lib/base.php - line 1004: OC\Route\Router->match('/apps/richdocum...')
    /var/www/html/nextcloud/index.php - line 48: OC handleRequest()
    {main}