Hardcode port to debug Render

config/puma.rb

@@ -25,7 +25,8 @@ end
 worker_timeout 3600 if ENV.fetch("RAILS_ENV", "development") == "development"
 
 # Specifies the `port` that Puma will listen on to receive requests; default is 3000.
-port ENV.fetch("PORT") { 3000 }
+# port ENV.fetch("PORT") { 3000 }
+port 3000
 
 # Specifies the `environment` that Puma will run in.
 environment ENV.fetch("RAILS_ENV") { "development" }