Hi @Emilio Pena , Thank you for reaching you Gluu support , I will assist you on this ticket.
This is likely the network connection , oxd server is not reachable by the client app.
I need some more information from you to figured out the cause of this problem.
Try to browse https://YOUROXDSERVERDOMAIN:8443/health-check on the client machine
OR
if you are on terminal try to use CURL request
curl -k https://YOUROXDSERVERDOMAIN:8443/health-check
if you not received response like "{"status":"running"}" then its likely is oxd server is not reachable to client that why you are getting connection refused.