SSH Tunnel "Failed to connect"

  • 31 August 2022
  • 0 replies

I’m trying to get our Looker instance to connect to Redshift via an SSH tunnel. Our looker instance is managed by Looker (not self-hosted). Version is 22.14.44.


The SSH server is an AWS EC2 instance with a public IP address. 

I’ve verified that our set-up works because our dbt Cloud projects can successfully read/write from/to the Redshift instance via SSH using the same server. 


At a high level, I’ve

  • created the user that Looker should use to SSH
  • Added the public key to /home/username/.ssh/authorized_keys 
  • whitelisted the public IPs for the EC2 security group, the same place where I whitelisted dbt Cloud’s IP addresses. The following IPs were whitelisted


I retried this by following this document:


But I am met with the same error. “Failed to connect”

A vague error

The `Log` section in the Admin UI doesn’t seem to provide more information. 


Has anyone encountered this issue before? If so, what else should I be checking? 


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