New install on Debian 10.  Used the installation guide here: 
https://docs.openproject.org/installation-and-operations/installation/packaged/#debian-installation

[root@openproject]: ~># openproject run check
[ok] MySQL configuration is working
[ok] Web server is running
[ok] openproject server is running
[ok] openproject background job worker is running
sending test email using sendmail...
[ok] test email sent to root@localhost

when I try to access the site I get a "Service Unavailable".   The log (/var/log/apache2/error.log) shows:

[Tue Sep 01 00:10:36.085016 2020] [core:notice] [pid 578:tid 140251952170112] AH00094: Command line: '/usr/sbin/apache2'
[Tue Sep 01 01:11:09.806898 2020] [proxy:error] [pid 588:tid 140251925272320] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.0.1:6000 (127.0.0.1) failed
[Tue Sep 01 01:11:09.806978 2020] [proxy_http:error] [pid 588:tid 140251925272320] [client 156.96.117.151:53617] AH01114: HTTP: failed to make connection to backend: 127.0.0.1
[Tue Sep 01 01:54:48.380741 2020] [proxy:error] [pid 588:tid 140251908486912] (111)Connection refused: AH00957: HTTP: attempt to connect to 127.0.0.1:6000 (127.0.0.1) failed

I guess the proxy (on port 6000) is not running??

[root@openproject]: ~># netstat -plnt
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      563/sshd
tcp        0      0 127.0.0.1:45432         0.0.0.0:*               LISTEN      671/postgres
tcp        0      0 0.0.0.0:25              0.0.0.0:*               LISTEN      827/master
tcp        0      0 127.0.0.1:11211         0.0.0.0:*               LISTEN      474/memcached
tcp6       0      0 :::22                   :::*                    LISTEN      563/sshd
tcp6       0      0 :::25                   :::*                    LISTEN      827/master
tcp6       0      0 :::80  

No proxy (Unicorn) running...

Checking the processes (ps):

$ ps aux

openpro+  6795 96.6 15.4 310832 156664 ?       Rl   02:11   0:13 /opt/openproject/vendor/bundle/ruby/2.6.0/bin/unicorn --config-file config/unicorn.rb --host 127.0.0.1 --port 6000 --env production

postgres  6799  1.0  1.7 214900 17576 ?        Ss   02:11   0:00 postgres: 10/main: openproject openproject 127.0.0.1(40818) idle

This shows Unicorn being started on port 6000 but...   It doesn't start?

Help?

Thanks