Terminating gateway errors with 'Connection reset by peer'

I’m working to create a terminating gateway to use Consul with a deployed nomad job. While the proxies show as connected in the Consul UI, whenever I try to connect to the service via the gateway, I get the error ‘Connection reset by peer’.

The steps I’m following to create the terminating gateway are at:
Register External Services with Consul Service Discovery | Consul | HashiCorp Developer

Any ideas on how to troubleshoot this error is appreciated.