端口3000上的Socket IO econnrefused

Question

I'm running a node server using socket.io 0.9.16 and after restarting my server recently I got the above mentioned error:

{ [Error: connect ECONNREFUSED]
  stack: 'Error: connect ECONNREFUSED\n    at exports._errnoException (util.js:676:11)\n    at Object.afterConnect [as oncomplete] (net.js:938:19)\n    --------------------\n    at Protocol._enqueue (
/var/www/node_modules/mysql-activerecord/node_modules/mysql/lib/protocol/Protocol.js:110:48)\n    at Protocol.handshake (/var/www/node_modules/mysql-activerecord/node_modules/mysql/lib/protocol/Protoc
ol.js:42:41)\n    at Connection.connect (/var/www/node_modules/mysql-activerecord/node_modules/mysql/lib/Connection.js:98:18)\n    at Connection._implyConnect (/var/www/node_modules/mysql-activerecord
/node_modules/mysql/lib/Connection.js:296:10)\n    at Connection.query (/var/www/node_modules/mysql-activerecord/node_modules/mysql/lib/Connection.js:154:8)\n    at get (/var/www/node_modules/mysql-ac
tiverecord/index.js:387:15)\n    at Manager.<anonymous> (/var/www/mutual.js:101:71)\n    at Manager.authorize (/var/www/node_modules/socket.io/lib/manager.js:910:31)\n    at Manager.handleHandshake (/
var/www/node_modules/socket.io/lib/manager.js:786:8)\n    at Manager.handleRequest (/var/www/node_modules/socket.io/lib/manager.js:593:12)',
  code: 'ECONNREFUSED',
  errno: 'ECONNREFUSED',
  syscall: 'connect',
  fatal: true }

nmap localhost returns:

Starting Nmap 5.21 ( http://nmap.org ) at 2014-07-22 21:02 EDT
Nmap scan report for localhost (127.0.0.1)
Host is up (0.0000050s latency).
Hostname localhost resolves to 2 IPs. Only scanned 127.0.0.1
rDNS record for 127.0.0.1: localhost.localdomain
Not shown: 992 closed ports
PORT     STATE SERVICE
22/tcp   open  ssh
25/tcp   open  smtp
53/tcp   open  domain
80/tcp   open  http
587/tcp  open  submission
3000/tcp open  ppp
3306/tcp open  mysql
9000/tcp open  cslistener

netstate -an | grep "LISTEN " returns

tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN     
tcp        0      0 0.0.0.0:3000            0.0.0.0:*               LISTEN     
...

iptables --list returns

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:3000

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Relevant server code:

var mysql = require('mysql-activerecord'),
    marked = require('marked'),
    conn = new mysql.Adapter({
            server: 'server-name',
            username: 'user',
            password: 'pass',
            database: 'database'
    }),
    moment = require('moment');

var io = require('socket.io').listen(3000);

Relevant client code:

a=io.connect("http://server-name:3000/",{query:stuff})

Thanks in advance for the help. Let me know if you need anymore information. Sorry if this post is a bit long.

Answer 1

The ECONNREFUSED has nothing to do with socket.io, if you look at the backtrace provided in the error, you can see it's coming from the mysql module. So it appears that your mysql server is not listening on server-name on port 3306 (or at least something is blocking access to it).