问题：
We have been trying to submit an app to the iTunes store using Application Loader for three days and keep getting stuck at the "Authenticating with the iTunes store" step.三天来，我们一直在尝试使用 Application Loader 向 iTunes 商店提交应用程序，但一直卡在“使用 iTunes 商店进行身份验证”步骤中。
We have read many forums (including stackoverflow) and tried what was suggested:我们已经阅读了许多论坛（包括 stackoverflow）并尝试了建议的内容：
- making a new provisioning profile制作新的配置文件
- using different or multiple versions of Application Loader使用不同或多个版本的 Application Loader
- changing proxy settings更改代理设置
- rebooting the Mac重新启动 Mac
- uploading at a different time of the day, etc.在一天中的不同时间上传等。
We have even left it running overnight and have not had success with getting past this step.我们甚至让它在一夜之间运行，并且没有成功通过这一步。 Unfortunately, no feedback is given about what the issue may be, and we have not gotten any error messages.不幸的是，没有给出关于问题可能是什么的反馈，我们也没有收到任何错误消息。 We have submitted multiple apps without any difficulty in the past but are completely stuck this time!我们过去提交了多个应用程序没有任何困难，但这次完全卡住了！
How were you able to solve it?你是怎么解决的？
解决方案：
参考一： https://en.stackoom.com/question/1WAYj参考二： https://stackoom.com/question/1WAYj