升级macOS Sonoma后代理请求失效及MySQL连接问题求助

问题概述 #

原本运行正常的Angular前端+Java后端开发测试环境，在升级macOS至Sonoma后出现连接问题：前端代理请求被拒绝，后端无法连接远程MySQL服务器。

报错详情 #

前端代理错误 #

[HPM] Error occurred while trying to proxy request /api/auth/get from localhost:4200 to http://localhost:8080 (ECONNREFUSED)

Java后端MySQL连接异常 #

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.29.jar:8.0.29]
    at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.29.jar:8.0.29]
    at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:828) ~[mysql-connector-java-8.0.29.jar:8.0.29]
    at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:448) ~[mysql-connector-java-8.0.29.jar:8.0.29]
    at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241) ~[mysql-connector-java-8.0.29.jar:8.0.29]

已尝试无效的方法 #

• 重启笔记本（此前同类问题可解决，本次无效）
• 在Angular代理配置中添加"changeOrigin": true（无效）

关键确认 #

已核实远程服务器运行正常，问题根源为本地与远程MySQL服务器的连接故障，无法修改远程服务器配置，需通过本地设置调整解决。

内容的提问来源于stack exchange，提问作者mintak