After upgrading from 2.4.2 to 2.6.x discourse is no longer working for us.
The issue is discourse is trying to connect to port 3000 on 127.0.0.1.
I have rebuilt web_only numerous times with ./launcher rebuild web_only
Questions.
Cheers and thanks!
as far as i know, that is the ruby install running on 3000
maybe do a full reboot
reboot or sudo reboot
P.s please tell me you did a backup before you upgraded.
Yes. Auto backup. The data container is up and running.
It’s on a production server. Other services are running on that server.
You need to rebuild your data container and then rebuild web_only. There are some hints in PostgreSQL 12 update.
I’ve run ./launcher rebuild data more than 5 times with no error messages.
I’m grateful this is happening our server and not on a clients 
seems like the upgrade to postgres 12 failed somehow.
Pups::ExecError: /root/upgrade_postgres failed with return #<Process::Status: pid 47 exit 1>
Location of failure: /pups/lib/pups/exec_command.rb:112:in `spawn'
exec failed with the params "/root/upgrade_postgres"
5a74b447cdef6a2db5ea79c2ae1e31f71d1d476179a3f61ea61fc21bf8382229
** FAILED TO BOOTSTRAP ** please scroll up and look for earlier error messages, there may be more than one.
./discourse-doctor may help diagnose the problem.
In this case the tables for the discourse database were all dropped somehow.
I decided to roll back to 2.4 and restore the discourse database.