Puma was wrongly configured

Author: lodewiges

config/puma.rb

@@ -24,7 +24,7 @@
 threads threads_count, threads_count
 
 # Specifies the `port` that Puma will listen on to receive requests; default is 3000.
-port ENV.fetch('PORT', 3000)
+port ENV.fetch('PORT', 5000)
 
 # Allow puma to be restarted by `bin/rails restart` command.
 plugin :tmp_restart