Mattermost can’t connect after attempting upgrade
Steps to reproduce
Had Mattermost 5.25 running on CentOS 7 box with nginx proxy.
Server was running PostgreSQL 9.4
Attempted to upgrade to 5.28 by following the steps on the upgrade page.
Upon starting mattermost no errors or logs at all are generated, just stays started in /var/log/messages
Nothing in the mattermost.log file
Browse to the mattermost public URL and nginx returns a 400 error.
Browse to the mattermost internal URL and it returns a page that says “Cannot connect to Mattermost. We’re having trouble connecting to Mattermost. If refreshing this page (Ctrl+R or Command+R) does not work, please verify that your computer is connected to the internet.”
Tried upgrading to postgres 10 after seeing the note about 9.4 going out of support, no difference.
Tried restoring the mattermost backup directory taken during the upgrade back to 5.25 and then starting mattermost again, no difference.
Running mattermost manually from command line does not show any output.
Not sure what else to try?