TCP connection failed in Unity in Pick and Place Tutorial

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1

I follow the instruction to set up the docker and unity. However, when I hit play, I cannot build the connection.
In unity, it reports “Connection to 127.0.0.1:10000 failed” and “The remote host forcibly closed an existing connection”.

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“远程主机强迫关闭了一个现有的连接” means “The remote host forcibly closed an existing connection”.