502 on a proxy means either the proxy has something wrong with it (unlikely, but worth a restart of the proxy to check), or that the thing it is proxying is not running or talking to the proxy.
Check what JIRA is doing, by reading the logs, and try a curl of the base url from the JIRA server to see if it can at least return its own login page.
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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