Failing to establish a connection to the source database

cutdata — Thu, 22 Jan 2026 19:47:01 GMT

Hello!

I'm trying to setup a demo enviroment for Talend Cloud. I have access to the trial tenant, and got a MySql running in a Docker container. I'm able to connect to this DB with mysql workstation from my host, but the connection fails in Talend Cloud. I've exposed the ports, mapped 3306 in container to 3307 in my host, and it still fails. I also don't need CDC atm, but tried with and without a data movement gateway, still no success.

Can I have some guidance in this concern? My goal is just a simple demo enviroment of QTC, with a simple source -> destination ETL.

Some screenshots attached.

Thanks!!

Re: Failing to establish a connection to the source database

gouravdubey5 — Tue, 27 Jan 2026 15:14:46 GMT

Hello,

The screenshots confirm that MySQL is running correctly in a local Docker container and is reachable from the host machine (MySQL Workbench connection to 127.0.0.1:3307).

However, this setup is not accessible from Talend Cloud. Talend Cloud jobs run in a remote cloud runtime, and localhost refers to the cloud environment itself, not your local machine. Docker port mapping only exposes the service locally and does not make it reachable from Talend Cloud.

Because no Data Movement Gateway is selected, Talend Cloud attempts a direct connection, which fails as expected.

To proceed, one of the following is required:

Deploy MySQL on a cloud-accessible host and connect using its public hostname/IP.

Install and select a Talend Data Movement Gateway on the machine where Docker is running.

For local testing only, use Talend Studio instead of Talend Cloud.

This is a network accessibility limitation, not a MySQL or Talend configuration issue.

Thanks,

Gourav

topic Failing to establish a connection to the source database in Talend Cloud

Failing to establish a connection to the source database

Re: Failing to establish a connection to the source database