Linux limits the external connection port modification

  

The pressure limit involves port limitation. The system default has restrictions. Use the following command to view: cat /proc/sys/net/ipv4/ip_local_port_range

The result is: 32768 61000 , the 32768 to 61000 ports are available, then you need to

change to: echo "10000 65535" > /proc/sys/net/ipv4/ip_local_port_range

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