問題：
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.三天來，我們一直在嘗試使用 Application Loader 向 iTunes 商店提交應用程序，但一直卡在“使用 iTunes 商店進行身份驗證”步驟中。
We have read many forums (including stackoverflow) and tried what was suggested:我們已經閱讀了許多論壇（包括 stackoverflow）並嘗試了建議的內容：
- making a new provisioning profile製作新的配置文件
- using different or multiple versions of Application Loader使用不同或多個版本的 Application Loader
- changing proxy settings更改代理設置
- rebooting the Mac重新啓動 Mac
- uploading at a different time of the day, etc.在一天中的不同時間上傳等。
We have even left it running overnight and have not had success with getting past this step.我們甚至讓它在一夜之間運行，並且沒有成功通過這一步。 Unfortunately, no feedback is given about what the issue may be, and we have not gotten any error messages.不幸的是，沒有給出關於問題可能是什麼的反饋，我們也沒有收到任何錯誤消息。 We have submitted multiple apps without any difficulty in the past but are completely stuck this time!我們過去提交了多個應用程序沒有任何困難，但這次完全卡住了！
How were you able to solve it?你是怎麼解決的？
解決方案：
參考一： https://en.stackoom.com/question/1WAYj參考二： https://stackoom.com/question/1WAYj