Can't find out where does a node.js app running and can't kill it

What I did: I have just set up node environment, installed express, create and installed an express project ``` express hello cd hello && npm install ``` then started the app with "`node app`". Environment: ``` yole@Yole:~$ lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux 7.2 (wheezy) Release: 7.2 Codename: wheezy yole@Yole:~$ node --version v0.10.22 yole@Yole:~$ express --version 3.4.4 ``` Problem When I want to stop this app, I used `CTRL+C,` but the thing I found is it did not stopped. Then I restarted the server! I found I can still access the page in browser. Orz. I have tried the following thing but still can't find out the running process. ``` yole@Yole:~$ killall node node: no process found yole@Yole:~$ ps -ef|grep node yole 3161 2888 0 16:57 pts/1 00:00:00 grep node yole@Yole:~$ netstat -apn|grep 3000 ``` Question How to find out the running node process or how to kill it. ===== update It is very strange that all browses in my machine can visit the site while it's not available on other machine! I only visit the page with Chrome before I stop the application. It seems to be a cache problem, but how cache shared among browsers..