This is most likely the result of a firewall inbetween Workato and the SSH server. "Connection resfused" means the SSH client, Workato in this case, is unable to make a connection to an SSH server on the IP and configured in the receipe.
Here are a list of publically availble SSH servers, (SFTP is just FTP over SSH so these should work for your connectivity testing) that should allow connections from Workato. https://www.sftp.net/public-online-sftp-servers
Another useful tool is Rebex SSH Check at https://sshcheck.com/ that will validate if your SSH server is reachable from the Internet. It only checks the handshake info so there is no username/password provided to the site. They also have some test servers https://test.rebex.net/.
When I put the IP address from your screenshot in https://sshcheck.com/ it failed, which tells me that to make it accessible to Workato you need to make some network access control changes.