How to Test an SSH Tunnel Connection

If you want to test your SSH Tunnel connection for interoperability with DLH.io to ensure DLH.io can reach your database securely behind your SSH server, the outlined instruction below should provide clarity on how to do so.

DLH.io SSH Tunneling Option



Our Recommendation for Testing

Based on our experience we recommend a few of tests to ensure that DLH.io is able to connect to your databases via SSH protocols. In DLH.io there are two options for connecting from DLH.io to your SSH Server. While the protocol is the same the selectivity of private/public key is different to allow for advanced use cases. Those options are:

1. Customer supplied Private Key
   1. This is the default and currently the preferred method for accounts. This may be later restricted to Enterprise accounts and above.
   2. To test the connection from one machine to another to emulate how DLH.io will connect to your SSH server :
      • Open a terminal window or similar UI application on your local machine, laptop, or virtual machine
      • Locate your SSH private key that is associated with the public key on your SSH server
      • Enter the standard ssh connection command using the user on the SSH server your key is associated with.
        • ssh dlh_ssh_user@<your_ssh_server_ip_address>
          If this doesn't connect then you have an issue somewhere in your network most likely. Please confirm any firewall settings and that you have grantlisted/safelisted IPs accordingly. ICMP protocol should be open on the machine as well.
        • ping <your_database_ip_or_dns>
        • Use telnet to confirm your terminal commands will actually reach the database via correct port
          • telnet <your_database_ip_or_dns> <your_database_port>
        • Log any issues and correct them before creating an SSH enabled connection integration on DLH.io or contact support
      • Done!
2. DLH.io supplied Public Key
   • Please contact support on how to get a public key if not on the Enterprise plan or not sure/confident on how to createa public and private key in your environment.