在使用Unity2017和最新的2018版本中会出现Failed to start Unity Package Manager的提示
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根据提示我们进入Editor的log文件（log文件一般在C:\Users\username\AppData\Local\Unity\Editor）中进行查看
COMMAND LINE ARGUMENTS:
C:\Program Files\Unity\Unity2018.1\Editor\Unity.exe
[Package Manager] Server::EnsureServerProcessIsRunning -- ReadyRequest exceeded maximum alloted time, ran for [10] seconds
[Package Manager] Server::Kill -- Server was shutdown
[Package Manager] PackageManager Server::Start -- Process restart attempt #2
从这里可以看出packageManager Server 被后台的防火墙给杀了
解决办法：关闭防火墙，打开工程，然后再打开防火墙
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