Question: When I am starting rails server using `rails s` command it is showing `A server is already running. Check C:/Sites/folder/Pids/Server.pids`

When I open the file it is outputting a 4 digit number only so how could I resolve this issue ? 

**FYI**

1. No other instance of Rails cmd is running this time.
2. Checked Task manager but only `cmd.exe` is showing no else process is running. (using Windows).

Answer: 
```
kill -9 $(lsof -i tcp:3000 -t)

```
I have face this issue in my rails application when i used docker in windows mechine.
i just removed the `server.pid` file from the project and restart the rails application.

You just need to delete `C:/Sites/folder/Pids/Server.pid` this file