Amazon web services AWS Lambda和Aurora数据库超时

我正在尝试使用Lambda函数连接到Amazon Aurora无服务器数据库，但是，每次我想要建立连接时，它都会超时。我将AWSLambdaVPCAccessExecutionRole附加到我的函数，并设置了运行数据库的同一安全组。我的入站和出站规则配置为允许同一安全组内端口3306上的TCP通信。

尽管如此，我还是会遇到以下错误：

{
    "errorType": "Error",
    "errorMessage": "connect ETIMEDOUT",
    "code": "ETIMEDOUT",
    "errorno": "ETIMEDOUT",
    "syscall": "connect",
    "fatal": true,
    "stack": [
        "Error: connect ETIMEDOUT",
        "    at Connection._handleConnectTimeout (/var/task/node_modules/mysql/lib/Connection.js:409:13)",
        "    at Object.onceWrapper (events.js:416:28)",
        "    at Socket.emit (events.js:310:20)",
        "    at Socket._onTimeout (net.js:479:8)",
        "    at listOnTimeout (internal/timers.js:549:17)",
        "    at processTimers (internal/timers.js:492:7)",
        "    --------------------",
        "    at Protocol._enqueue (/var/task/node_modules/mysql/lib/protocol/Protocol.js:144:48)",
        "    at Protocol.handshake (/var/task/node_modules/mysql/lib/protocol/Protocol.js:51:23)",
        "    at Connection.connect (/var/task/node_modules/mysql/lib/Connection.js:116:18)",
        "    at Object.<anonymous> (/var/task/src/handlers/CognitoVerifyTrigger.js:50:9)",
        "    at Module._compile (internal/modules/cjs/loader.js:1133:30)",
        "    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1153:10)",
        "    at Module.load (internal/modules/cjs/loader.js:977:32)",
        "    at Function.Module._load (internal/modules/cjs/loader.js:877:14)",
        "    at Module.require (internal/modules/cjs/loader.js:1019:19)",
        "    at require (internal/modules/cjs/helpers.js:77:18)"
    ]
}

在这一点上，我不知道为什么连接失败。Lambda和RDS在同一个安全组中运行，Lambda拥有访问VPC的权限，配置了入站/出站规则。 当使用EC2实例时，我可以连接到我的Aurora数据库，因此我认为我的Lambda配置有问题

---

除了属性“Role”和“VpcConfig”之外，我是否还需要在Lambda模板文件中添加一些特殊的内容？

尝试将Lambda的安全组设置为RDS安全组的入站源，以解决此问题。

是自定义VPC还是默认VPC？@Marcin我当前正在使用默认的VPC。找到解决方案了吗？？

const mysql = require('mysql');

var con = mysql.createConnection({
    host: '*******.*********.eu-central-1.rds.amazonaws.com',
    user: '****',
    password: '****',
    database: 'userdata',
    port: 3306
});
con.connect((err) => {
    if (err) {
        console.log('Failed to establish database connection.');
        throw err;
    }
    console.log('Connection to database has been established.');
});