creatempuobject上传错误

使用create_mpu_object，之前正常，结果今天就不行了。。。
报错信息为：

PHP Fatal error:  Uncaught exception 'RequestCore_Exception' with message 'cURL resource: Resource id #22; cURL error: Couldn't resolve host 'oss-internal.aliyuncs.com' (6)' in /var/www/ColorXTest/upload/lib/lib/requestcore/requestcore.class.php:825\nStack trace:\n#0 /var/www/ColorXTest/upload/lib/sdk.class.php(603): RequestCore->send_request()\n#1 /var/www/ColorXTest/upload/lib/sdk.class.php(967): ALIOSS->auth(Array)\n#2 /var/www/ColorXTest/upload/lib/sdk.class.php(1568): ALIOSS->upload_file_by_file('', '...', '...')\n#3 /var/www/ColorXTest/upload/create.php(210): ALIOSS->create_mpu_object('', '...', )\n#4 {main}\n  thrown in /var/www/ColorXTest/upload/lib/lib/requestcore/requestcore.class.php on line 825


有没有哪位大侠指点一下是什么问题？