Ubuntu/ Virtualenv/ Python3.4/ Gunicorn/ Nginx gunicorn ERROR: Connection in use: ('0.0.0.0', 8000)
<p>I have looked across the internet, including StackOverflow, and have seen similar problems, but after several hours I am stumped.</p>

<p>I can add in any information that anyone thinks might be of use. 
I am on DigitalOcean droplet Ubuntu14.0.4, in virtualenv named 'sod22', with Python3.4, Django1.8, Gunicorn19.4.5, nginx1.4.6
Here is my error output in Bash:</p>

<pre><code>(sod22) root@ShapeOfData2:~/.virtualenvs/sod22# gunicorn --bind    0.0.0.0:8000 sod22.wsgi:application
[2016-01-27 02:25:18 -0500] [25609] [INFO] Starting gunicorn 19.4.5
[2016-01-27 02:25:18 -0500] [25609] [ERROR] Connection in use: ('0.0.0.0', 8000)
[2016-01-27 02:25:18 -0500] [25609] [ERROR] Retrying in 1 second.
[2016-01-27 02:25:19 -0500] [25609] [ERROR] Connection in use: ('0.0.0.0', 8000)
[2016-01-27 02:25:19 -0500] [25609] [ERROR] Retrying in 1 second.
[2016-01-27 02:25:20 -0500] [25609] [ERROR] Connection in use: ('0.0.0.0', 8000)
[2016-01-27 02:25:20 -0500] [25609] [ERROR] Retrying in 1 second.
[2016-01-27 02:25:21 -0500] [25609] [ERROR] Connection in use: ('0.0.0.0', 8000)
[2016-01-27 02:25:21 -0500] [25609] [ERROR] Retrying in 1 second.
[2016-01-27 02:25:22 -0500] [25609] [ERROR] Connection in use: ('0.0.0.0', 8000)
[2016-01-27 02:25:22 -0500] [25609] [ERROR] Retrying in 1 second.
[2016-01-27 02:25:23 -0500] [25609] [ERROR] Can't connect to ('0.0.0.0', 8000)
</code></pre>

<p>I have checked for processes that might be running on port 8000 using netstat:</p>

<pre><code>(sod22) root@ShapeOfData2:~/.virtualenvs/sod22# netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      16069/nginx     
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      3411/sshd       
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN      14574/postgres  
tcp        0      0 127.0.0.1:8000          0.0.0.0:*               LISTEN      25638/python3.4 
tcp6       0      0 :::80                   :::*                    LISTEN      16069/nginx     
tcp6       0      0 :::22                   :::*                    LISTEN      3411/sshd    
</code></pre>

<p>I have killed all Gunicorn processes, but get the same behavior. However, with a different command my console seems to 'lock up' and there is still no output to the web page:</p>

<pre><code>(sod22) root@ShapeOfData2:~/.virtualenvs/sod22# gunicorn sod22.wsgi:application
[2016-01-27 02:27:17 -0500] [25638] [INFO] Starting gunicorn 19.4.5
[2016-01-27 02:27:17 -0500] [25638] [INFO] Listening at: http://127.0.0.1:8000 (25638)
[2016-01-27 02:27:17 -0500] [25638] [INFO] Using worker: sync
[2016-01-27 02:27:17 -0500] [25641] [INFO] Booting worker with pid: 25641
</code></pre>

<p>At that point there is no cursor to try anything else, without killing the console at this point.</p>

<p>Per Sayse's advice, I checked out the processes and results after killing processes. Maybe Python is using port:8000 and continuously refreshing after it is killed? See below, note that after the process is killed, I check again, and it is running again:</p>

<pre><code>(sod22) root@ShapeOfData2:~/.virtualenvs/sod22# netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      16069/nginx     
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      3411/sshd       
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN      14574/postgres  
tcp        0      0 127.0.0.1:8000          0.0.0.0:*               LISTEN      25638/python3.4 
tcp6       0      0 :::80                   :::*                    LISTEN      16069/nginx     
tcp6       0      0 :::22                   :::*                    LISTEN      3411/sshd       
(sod22) root@ShapeOfData2:~/.virtualenvs/sod22# kill 25638
(sod22) root@ShapeOfData2:~/.virtualenvs/sod22# netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      16069/nginx     
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      3411/sshd       
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN      14574/postgres  
tcp        0      0 127.0.0.1:8000          0.0.0.0:*               LISTEN      25638/python3.4 
tcp6       0      0 :::80                   :::*                    LISTEN      16069/nginx     
tcp6       0      0 :::22                   :::*                    LISTEN      3411/sshd 
</code></pre>

<p>Thanks in advance. Surely I'm not the only one that has experienced this!</p>