Question: I installed redis this afternoon and it caused a few errors, so I uninstalled it but this error is persisting when I launch the app with `foreman start`. Any ideas on a fix? 

```
foreman start
22:46:26 web.1  | started with pid 1727
22:46:26 web.1  | 2013-05-25 22:46:26 [1727] [INFO] Starting gunicorn 0.17.4
22:46:26 web.1  | 2013-05-25 22:46:26 [1727] [ERROR] Connection in use: ('0.0.0.0', 5000)

```

Answer: 
Check your processes. You may have had an unclean exit, leaving a zombie'd process behind that's still running.
This should do the trick for you: 

`kill -9 $(lsof -i:5000 -t) 2> /dev/null`

where 5000 is the port you want to kill