Connected to the db and then "ECONNREFUSED"

Hi I am using a QNAP NAS to Dockerize nodejs server and mariadb. Versions are node 22.17.1 and mariadb 11.8.2. I am using sequelize and mariadb connector. These are the relevant scripts: > server.js ```const express = require('express'); const { connectDB } = require('./config/db'); ........ const app = express(); // Connect Database connectDB(); // Init Middleware app.use(express.json({ extended: false })); app.use(cors()); // Define Routes app.use(............); syncModels().then(() => { const HTTP_PORT = process.env.PORT_LOCAL; const HTTPS_PORT = process.env.PORT_SSL; // Start HTTP Server http.createServer(app).listen(HTTP_PORT, () => { ............. }); }); ``` > db.js ```const { Sequelize } = require('sequelize'); require('dotenv').config(); console.log(process.env.DB_NAME); const sequelize = new Sequelize(process.env.DB_NAME, process.env.DB_USER, process.env.DB_PASS, { host: process.env.DB_HOST, port: process.env.DB_PORT, dialect: process.env.DB_DIALECT, logging: false, pool: { max: 10, min: 0, acquire: 20000, idle: 10000 }, dialectOptions: { connectTimeout: 5000 } }); const connectDB = async (retries = 5, delay = 2000) => { let attempts = 0; while (attempts < retries) { try { await sequelize.authenticate(); console.log('✅ MySQL conectado exitosamente'); return; } catch (err) { attempts++; console.error(`❌ Fallo al conectar a la base de datos (intento ${attempts}/${retries}): ${err.message}`); if (attempts < retries) { console.log(`Reintentando en ${delay / 1000} segundos...`); await new Promise(res => setTimeout(res, delay)); } else { if (process.env.NODE_ENV !== 'production') { console.error(err); // Muestra stacktrace completo en desarrollo } process.exit(1); } } } }; module.exports = { connectDB, sequelize }; ``` The dependencies are these: ``` "bcryptjs": "2.4.3", "cors": "2.8.5", "dotenv": "16.6.1", "express": "4.21.2", "jsonwebtoken": "9.0.2", "mariadb": "2.5.6", "sequelize": "6.32.1" ``` The issue is that when I start the server it starts normally, few seconds later the connection starts to crashing and I am getting "ECONNREFUSED" or "EHOSTUNREACH". I have checked to have connection to the db with DBeaver, successfully and I made net ping from nodejs db docker and successfully too. Logs first connection OK: ``` 16 packages are looking for funding run `npm fund` for details found 0 vulnerabilities ___________________ ✅ MySQL conectado exitosamente Database & tables sync! HTTP Server started on port 5001 HTTPS Server started on port 5000 /app/node_modules/sequelize/lib/dialects/mariadb/connection-manager.js:87 throw new SequelizeErrors.ConnectionRefusedError(err); ^ ConnectionRefusedError [SequelizeConnectionRefusedError]: connect ECONNREFUSED 192.168.0.40:3306 at ConnectionManager.connect (/app/node_modules/sequelize/lib/dialects/mariadb/connection-manager.js:87:17) at process.processTicksAndRejections (node:internal/process/task_queues:105:5) at async ConnectionManager._connect (/app/node_modules/sequelize/lib/dialects/abstract/connection-manager.js:222:24) { parent: Error: connect ECONNREFUSED 192.168.0.40:3306 at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1637:16) From event: at _registerHandshakeCmd (/app/node_modules/mariadb/lib/connection.js:745:11) at /app/node_modules/mariadb/lib/connection.js:57:11 at new Promise (<anonymous>) at Connection.connect (/app/node_modules/mariadb/lib/connection.js:56:16) at Object.createConnection (/app/node_modules/mariadb/promise.js:31:36) at ConnectionManager.connect (/app/node_modules/sequelize/lib/dialects/mariadb/connection-manager.js:71:41) at ConnectionManager._connect (/app/node_modules/sequelize/lib/dialects/abstract/connection-manager.js:222:61) at process.processTicksAndRejections (node:internal/process/task_queues:105:5) { errno: -111, code: 'ECONNREFUSED', syscall: 'connect', address: '192.168.0.40', port: 3306, fatal: true }, original: Error: connect ECONNREFUSED 192.168.0.40:3306 at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1637:16) From event: at _registerHandshakeCmd (/app/node_modules/mariadb/lib/connection.js:745:11) at /app/node_modules/mariadb/lib/connection.js:57:11 at new Promise (<anonymous>) at Connection.connect (/app/node_modules/mariadb/lib/connection.js:56:16) at Object.createConnection (/app/node_modules/mariadb/promise.js:31:36) at ConnectionManager.connect (/app/node_modules/sequelize/lib/dialects/mariadb/connection-manager.js:71:41) at ConnectionManager._connect (/app/node_modules/sequelize/lib/dialects/abstract/connection-manager.js:222:61) at process.processTicksAndRejections (node:internal/process/task_queues:105:5) { errno: -111, code: 'ECONNREFUSED', syscall: 'connect', address: '192.168.0.40', port: 3306, fatal: true } } ``` Logs attempting restart the server after the log above: ``` 16 packages are looking for funding run `npm fund` for details ___________________ ❌ Fallo al conectar a la base de datos (intento 1/5): connect EHOSTUNREACH 192.168.0.40:3306 Reintentando en 2 segundos... Error syncing models: connect EHOSTUNREACH 192.168.0.40:3306 HTTP Server started on port 5001 HTTPS Server started on port 5000 ``` MariaDB Docker Logs: ``` 2025-07-29 11:59:11+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.8.2+maria~ubu2404 started. 2025-07-29 11:59:12+00:00 [Warn] [Entrypoint]: /sys/fs/cgroup/ame=systemd:/docker/866a4a7a682c7dee0e7c335aba8a89eda3fc08aba595cb3fd1d84936759c0f1d 8:pids:/docker/866a4a7a682c7dee0e7c335aba8a89eda3fc08aba595cb3fd1d84936759c0f1d 7:freezer:/docker/866a4a7a682c7dee0e7c335aba8a89eda3fc08aba595cb3fd1d84936759c0f1d 6:devices:/docker/866a4a7a682c7dee0e7c335aba8a89eda3fc08aba595cb3fd1d84936759c0f1d 5:blkio:/docker/866a4a7a682c7dee0e7c335aba8a89eda3fc08aba595cb3fd1d84936759c0f1d 4:cpuacct:/docker/866a4a7a682c7dee0e7c335aba8a89eda3fc08aba595cb3fd1d84936759c0f1d 3:cpuset:/docker/866a4a7a682c7dee0e7c335aba8a89eda3fc08aba595cb3fd1d84936759c0f1d 2:cpu:/docker/866a4a7a682c7dee0e7c335aba8a89eda3fc08aba595cb3fd1d84936759c0f1d 1:memory:/docker/866a4a7a682c7dee0e7c335aba8a89eda3fc08aba595cb3fd1d84936759c0f1d/memory.pressure not writable, functionality unavailable to MariaDB 2025-07-29 11:59:12+00:00 [Note] [Entrypoint]: Switching to dedicated user 'mysql' 2025-07-29 11:59:12+00:00 [Note] [Entrypoint]: Entrypoint script for MariaDB Server 1:11.8.2+maria~ubu2404 started. 2025-07-29 11:59:12+00:00 [Note] [Entrypoint]: MariaDB upgrade not required 2025-07-29 11:59:12 0 [Note] Starting MariaDB 11.8.2-MariaDB-ubu2404 source revision 8d36cafe4fc700e6e577d5a36650c58707e76b92 server_uid C4AU8loddRTPBoRpCKIQ79a15go= as process 1 2025-07-29 11:59:13 0 [Note] InnoDB: Compressed tables use zlib 1.3 2025-07-29 11:59:13 0 [Note] InnoDB: Number of transaction pools: 1 2025-07-29 11:59:13 0 [Note] InnoDB: Using crc32 + pclmulqdq instructions 2025-07-29 11:59:13 0 [Note] mariadbd: O_TMPFILE is not supported on /tmp (disabling future attempts) 2025-07-29 11:59:13 0 [Warning] mariadbd: io_uring_queue_init() failed with EPERM: sysctl kernel.io_uring_disabled has the value 2, or 1 and the user of the process is not a member of sysctl kernel.io_uring_group. (see man 2 io_uring_setup). 2025-07-29 11:59:13 0 [Warning] InnoDB: liburing disabled: falling back to innodb_use_native_aio=OFF 2025-07-29 11:59:13 0 [Note] InnoDB: innodb_buffer_pool_size_max=128m, innodb_buffer_pool_size=128m 2025-07-29 11:59:13 0 [Note] InnoDB: Completed initialization of buffer pool 2025-07-29 11:59:13 0 [Note] InnoDB: File system buffers for log disabled (block size=4096 bytes) 2025-07-29 11:59:13 0 [Note] InnoDB: End of log at LSN=1859592 2025-07-29 11:59:13 0 [Note] InnoDB: Opened 3 undo tablespaces 2025-07-29 11:59:13 0 [Note] InnoDB: 128 rollback segments in 3 undo tablespaces are active. 2025-07-29 11:59:13 0 [Note] InnoDB: Setting file './ibtmp1' size to 12.000MiB. Physically writing the file full; Please wait ... 2025-07-29 11:59:13 0 [Note] InnoDB: File './ibtmp1' size is now 12.000MiB. 2025-07-29 11:59:13 0 [Note] InnoDB: log sequence number 1859592; transaction id 88 2025-07-29 11:59:13 0 [Note] Plugin 'FEEDBACK' is disabled. 2025-07-29 11:59:13 0 [Note] Plugin 'wsrep-provider' is disabled. 2025-07-29 11:59:13 0 [Note] InnoDB: Loading buffer pool(s) from /var/lib/mysql/ib_buffer_pool 2025-07-29 11:59:14 0 [Note] InnoDB: Buffer pool(s) load completed at 250729 11:59:14 2025-07-29 11:59:22 0 [Note] Server socket created on IP: '0.0.0.0'. 2025-07-29 11:59:22 0 [Note] Server socket created on IP: '::'. 2025-07-29 11:59:22 0 [Note] mariadbd: Event Scheduler: Loaded 0 events 2025-07-29 11:59:22 0 [Note] mariadbd: ready for connections. Version: '11.8.2-MariaDB-ubu2404' socket: '/run/mysqld/mysqld.sock' port: 3306 mariadb.org binary distribution ``` I don't know if the cause is comming by MariaDB, the connector, sequelize... Anybody can help me please?