终端连接数量过多时则会报错(SSH connection error: (SSH) Channel open failure: open failed)

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终端连接数量过多(超过9)时则会报错：
Reconnecting...
SSH connection error: (SSH) Channel open failure: open failed
Reconnecting...
SSH connection error: (SSH) Channel open failure: open failed
Reconnecting...
SSH connection error: (SSH) Channel open failure: open failed