Problems and Phenomena.
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Analysis steps:
1.Confirm the public IP / LAN IP configuration of the server.
2.Confirm port.
Step 1:Confirm the public IP / LAN IP configuration of the server.
Suggestion: if it is a single server, it is recommended to configure the LAN address as 127.0.0.1 and the public network address as the public network address
Step 2: Confirm port.
Determine whether the configuration of each server is consistent as shown in the figure below