added warning message from default error event handler

Author: einaros

lib/socket.io.js

@@ -59,7 +59,9 @@ exports.listen = function (server, options, fn) {
       server = require('http').createServer();
 
     // default error handler
-    server.on('error', function() { });
+    server.on('error', function(err) {
+      this.log.warn('error: "' + err + '"');      
+    });
 
     // default response
     server.on('request', function (req, res) {