C2_W3 Lab 2 — EC2 Instance Connect fails to connect to the bastion host ID LAB: obahktgusokj

Course Q&A Data Engineering Source Systems, Data Ingestion, and Pipelines
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I’m stuck on the C2_W3 Lab 2 assignment. Following the lab instructions, I open the AWS console and try to connect to the bastion host using EC2 Instance Connect, but the connection always fails with this error:

No se pudo conectar a la instancia Error al establecer la conexión SSH con la instancia. Inténtelo de nuevo más tarde.

(In English: “Could not connect to the instance — Error establishing SSH connection to the instance. Please try again later.”)

What I have already checked, and everything looks correct:

  • The instance de-c2w3lab2-bastion-host is in state running, and both status checks are ok
  • The public IP shown in the console matches the instance’s actual public IP
  • The security group allows inbound TCP port 22 from 0.0.0.0/0 (confirmed with describe-security-groups)
  • The user_data script completed successfully — the instance console output shows cloud-init finished and postgresql-client was installed
  • The SSH key de-c2w3lab2-bastion-host-key is present in /home/ubuntu/.ssh/authorized_keys
  • I restarted the lab session and re-ran source scripts/setup.sh; AWS credentials work fine (aws sts get-caller-identity returns my voclabs ARN)
  • The lab says to connect to the DB through the bastion host, but it doesn’t describe what to do when this error appears.