Connection refused: connect; nested exception is Connection refused: [How to Solve]

1. Cause of error: the password of the database connection is wrong, so it can be modified

I use the Nacos registry to check whether the password is correct in the configuration file

2. Reasons for error reporting  : The access port is occupied. Please refer to this document to release the port 56859779/article/details/119204459?spm=1001.2014.3001.5502

3. Cause of error: the provider of remote call, the port of application.yml in the configuration file is wrong, and it is changed to the access port

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