[BUG] MQTTErrorCode.MQTT_ERR_CONN_LOST

[pro100805]

a clean installation was performed
the gateway does not want to connect to the TB server

● thingsboard-gateway.service - ThingsBoard Gateway
Loaded: loaded (/etc/systemd/system/thingsboard-gateway.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2024-11-15 11:23:41 UTC; 4s ago
Main PID: 10627 (python3)
Tasks: 6 (limit: 2225)
Memory: 46.2M
CPU: 444ms
CGroup: /system.slice/thingsboard-gateway.service
└─10627 /var/lib/thingsboard_gateway/venv/bin/python3 -c "from thingsboard_gateway.tb_gateway import daemon; daemon()"

Nov 15 11:23:41 test-22-04-4 systemd[1]: Started ThingsBoard Gateway.
Nov 15 11:23:42 test-22-04-4 python3[10627]: 2024-11-15 11:23:42 - |INFO| - [tb_gateway_service.py] - tb_gateway_service - init - 185 - Gateway starting...
Nov 15 11:23:43 test-22-04-4 python3[10627]: 2024-11-15 11:23:43 - |INFO| - [tb_gateway_service.py] - tb_gateway_service - init - 193 - ThingsBoard IoT gateway version: 3.6.1
Nov 15 11:23:43 test-22-04-4 python3[10627]: 2024-11-15 11:23:43 - |INFO| - [tb_gateway_service.py] - tb_gateway_service - _load_connectors - 961 - Connectors - not found, waiting for remote configuration.
Nov 15 11:23:43 test-22-04-4 python3[10627]: 2024-11-15 11:23:43 - |INFO| - [tb_client.py] - tb_client - connect - 322 - Connecting to ThingsBoard...
Nov 15 11:23:43 test-22-04-4 python3[10627]: 2024-11-15 11:23:43 - |INFO| - [tb_client.py] - tb_client - connect - 326 - Sending connect to platform...
Nov 15 11:23:43 test-22-04-4 python3[10627]: 2024-11-15 11:23:43 - |INFO| - [tb_client.py] - tb_client - connect - 329 - Connect msg sent to platform.
Nov 15 11:23:43 test-22-04-4 python3[10627]: 2024-11-15 11:23:43 - |ERROR| - [tb_device_mqtt.py] - tb_device_mqtt - _on_connect - 449 - connection FAIL with error Bad user name or password Bad user name or password
Nov 15 11:23:43 test-22-04-4 python3[10627]: 2024-11-15 11:23:43 - |WARNING| - [tb_device_mqtt.py] - tb_device_mqtt - _on_disconnect - 427 - MQTT client was disconnected with reason code MQTTErrorCode.MQTT_ERR_PROTOCOL (A network protocol error occurred when communicating with the broker.)
Nov 15 11:23:44 test-22-04-4 python3[10627]: 2024-11-15 11:23:44 - |INFO| - [tb_client.py] - tb_client - connect - 322 - Connecting to ThingsBoard...

• OS:Ubuntu Server 22.04.4
• Thingsboard 3.8.1
• IoT Gateway 3.6.1
• Python 3.10.12