Connect shinyapps.io to Cockroach DB

Has anyone successfully connected a Shiny application (hosted on shinyapps.io) to a remote Cockroach labs database cluster?

Even after whitelisting the shinyapps.io IP address, as outlined here, but I'm still receiving the error message:

Warning: Error in : could not connect to server: Connection refused
Is the server running on host "localhost" (127.0.0.1) and accepting

Any expertise is greatly appreciated.

Thanks