uploading stuck on "Authenticating with iTunes connect"

最近两天，上传ipa到App connect一直卡在 "Authenticating with iTunes connect"，等好久都没有继续，试了很多次也不行。

google到的方法是update iTMSTransporter，方法如下：

// 控制台输入命令
# cd ~
# mv .itmstransporter/ .old_itmstransporter/  
# /Applications/Xcode.app/Contents/Applications/Application\ Loader.app/Contents/itms/bin/iTMSTransporter
// 以下是控制台打印出的update信息。。
[2019-04-10 13:56:37 CST] 
  INFO: Transporter is searching for new software components.
[2019-04-10 13:56:39 CST]   INFO: Downloading com.apple.transporter.mediatoolkit/1.13.0...
[2019-04-10 13:58:03 CST]   INFO: Download complete for: com.apple.transporter.mediatoolkit/1.13.0.
[2019-04-10 13:58:04 CST] 
  INFO: indexing file: /Users/icbs/.itmstransporter/obr/1.13.0/com.apple.transporter.mediatoolkit-1.13.0.jar
[2019-04-10 13:58:04 CST] 
  INFO: indexing file: /Users/icbs/.itmstransporter/obr/1.13.0/com.apple.cie.rio.servicetrace.service-trace-3.2.0.01-13-00-07.jar
。。。。。。
[2019-04-10 13:58:05 CST] 
  INFO: indexing file: /Users/icbs/.itmstransporter/obr/1.13.0/com.sun.istack.commons-runtime-3.0.7.jar
[2019-04-10 13:58:05 CST] 
  INFO: indexing file: /Users/icbs/.itmstransporter/obr/1.13.0/org.apache.commons.exec-1.3.0.jar
[2019-04-10 13:58:05 CST] 
  INFO: indexing file: /Users/icbs/.itmstransporter/obr/1.13.0/com.sun.xml.bind.jaxb-impl-2.3.1.jar
[2019-04-10 13:58:05 CST] 
  INFO: Update check complete.
[2019-04-10 13:58:06 CST] 
  INFO: Logging configured successfully.
usage: iTMSTransporter [-help  | -info | -m  | -version]   [-o ] [-v
       ]  [-WONoPause ] [-Xmx4096m]
iTMSTransporter : iTunes Store Transporter 1.13.0
// 接下来就打印出了usage具体内容，略

网上说一定要等到update成功，但是我始终没有看到网上能搜到的提示更新成功的语句。
只是看到了上面的。

但是，自从这个update完成以后，再使用Xcode提交就能成功了，姑且算是一个解决方法吧