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
Whe
Just open that C:/Sites/folder/Pids/Server.pids and copy that 4 digit value.that 4 digit value is nothing but a PID, which you need to kill to stop the already running process.
then to stop the process use below command
kill -9
once that already running process get stopped then hit
rails s to start the rails server