Listen to a different IP address

I think the "unlisten" function you're looking for is called "close": http://nodejs.org/api/http.html#http_server_close_callback

you have to use server.close() not app.close()..

var express = require('express')
  , http = require('http')
  , app = express()
  , server = http.createServer(app)

app.get('/',function(req,res){
  ...
})

server.listen(8000,'127.0.0.1',function(){
 server.close(function(){
   server.listen(8001,'192.168.0.202')
 })
})

should work