diff --git a/docs/API.md b/docs/API.md
index 3b5e1b28d7..ea7c15ed78 100644
--- a/docs/API.md
+++ b/docs/API.md
@@ -20,7 +20,6 @@
     - [server.onconnection(socket)](#serveronconnectionsocket)
     - [server.of(nsp)](#serverofnsp)
     - [server.close([callback])](#serverclosecallback)
-    - [server.useNamespaceValidator(fn)](#serverusenamespacevalidatorfn)
   - [Class: Namespace](#namespace)
     - [namespace.name](#namespacename)
     - [namespace.connected](#namespaceconnected)
@@ -322,22 +321,6 @@ server.listen(PORT); // PORT is free to use
 io = Server(server);
 ```
 
-#### server.useNamespaceValidator(fn)
-
-  - `fn` _(Function)_
-
-Sets up server middleware to validate whether a new namespace should be created.
-
-```js
-io.useNamespaceValidator((nsp, next) => {
-  if (nsp === 'dynamic') {
-    next(null, true);
-  } else {
-    next(new Error('Invalid namespace'));
-  }
-});
-```
-
 #### server.engine.generateId
 
 Overwrites the default method to generate your custom socket id.
diff --git a/lib/client.js b/lib/client.js
index adb5d20f73..0b5f0446e9 100644
--- a/lib/client.js
+++ b/lib/client.js
@@ -56,38 +56,17 @@ Client.prototype.setup = function(){
  * Connects a client to a namespace.
  *
  * @param {String} name namespace
- * @param {String} query the query parameters
  * @api private
  */
 
 Client.prototype.connect = function(name, query){
-  if (this.server.nsps[name]) {
-    debug('connecting to namespace %s', name);
-    return this.doConnect(name, query);
+  debug('connecting to namespace %s', name);
+  var nsp = this.server.nsps[name];
+  if (!nsp) {
+    this.packet({ type: parser.ERROR, nsp: name, data : 'Invalid namespace'});
+    return;
   }
 
-  this.server.checkNamespace(name, (allow) => {
-    if (allow) {
-      debug('creating namespace %s', name);
-      this.doConnect(name, query);
-    } else {
-      debug('creation of namespace %s was denied', name);
-      this.packet({ type: parser.ERROR, nsp: name, data: 'Invalid namespace' });
-    }
-  });
-};
-
-/**
- * Connects a client to a namespace.
- *
- * @param {String} name namespace
- * @param {String} query the query parameters
- * @api private
- */
-
-Client.prototype.doConnect = function(name, query){
-  var nsp = this.server.of(name);
-
   if ('/' != name && !this.nsps['/']) {
     this.connectBuffer.push(name);
     return;
diff --git a/lib/index.js b/lib/index.js
index 016353966f..7bb31666b8 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -46,7 +46,6 @@ function Server(srv, opts){
   }
   opts = opts || {};
   this.nsps = {};
-  this.nspValidators = [];
   this.path(opts.path || '/socket.io');
   this.serveClient(false !== opts.serveClient);
   this.parser = opts.parser || parser;
@@ -160,53 +159,6 @@ Server.prototype.set = function(key, val){
   return this;
 };
 
-/**
- * Sets up server middleware to validate incoming namespaces not already created on the server.
- *
- * @return {Server} self
- * @api public
- */
-
-Server.prototype.useNamespaceValidator = function(fn){
-  this.nspValidators.push(fn);
-  return this;
-};
-
-/**
- * Executes the middleware for an incoming namespace not already created on the server.
- *
- * @param name of incomming namespace
- * @param {Function} last fn call in the middleware
- * @api private
- */
-
-Server.prototype.checkNamespace = function(name, fn){
-  var fns = this.nspValidators.slice(0);
-  if (!fns.length) return fn(false);
-
-  var namespaceAllowed = false; // Deny unknown namespaces by default
-
-  function run(i){
-    fns[i](name, function(err, allow){
-      // upon error, short-circuit
-      if (err) return fn(false);
-
-      // if one piece of middleware explicitly denies namespace, short-circuit
-      if (allow === false) return fn(false);
-
-      namespaceAllowed = namespaceAllowed || allow === true;
-
-      // if no middleware left, summon callback
-      if (!fns[i + 1]) return fn(namespaceAllowed);
-
-      // go on to next
-      run(i + 1);
-    });
-  }
-
-  run(0);
-};
-
 /**
  * Sets the client serving path.
  *
diff --git a/test/socket.io.js b/test/socket.io.js
index c5f96dc63e..975d04ae0f 100644
--- a/test/socket.io.js
+++ b/test/socket.io.js
@@ -889,81 +889,6 @@ describe('socket.io', function(){
         });
       });
     });
-
-    describe('dynamic', function () {
-      it('should allow connections to dynamic namespaces', function(done){
-        var srv = http();
-        var sio = io(srv);
-        srv.listen(function(){
-          var namespace = '/dynamic';
-          var dynamic = client(srv, namespace);
-          sio.useNamespaceValidator(function(nsp, next) {
-            expect(nsp).to.be(namespace);
-            next(null, true);
-          });
-          dynamic.on('error', function(err) {
-            expect().fail();
-          });
-          dynamic.on('connect', function() {
-            expect(sio.nsps[namespace]).to.be.a(Namespace);
-            expect(Object.keys(sio.nsps[namespace].sockets).length).to.be(1);
-            done();
-          });
-        });
-      });
-
-      it('should not allow connections to dynamic namespaces if not supported', function(done){
-        var srv = http();
-        var sio = io(srv);
-        srv.listen(function(){
-          var namespace = '/dynamic';
-          sio.useNamespaceValidator(function(nsp, next) {
-            expect(nsp).to.be(namespace);
-            next(null, false);
-          });
-          sio.on('connect', function(socket) {
-            if (socket.nsp.name === namespace) {
-              expect().fail();
-            }
-          });
-
-          var dynamic = client(srv,namespace);
-          dynamic.on('connect', function(){
-            expect().fail();
-          });
-          dynamic.on('error', function(err) {
-            expect(err).to.be("Invalid namespace");
-            done();
-          });
-        });
-      });
-
-      it('should not allow connections to dynamic namespaces if there is an error', function(done){
-        var srv = http();
-        var sio = io(srv);
-        srv.listen(function(){
-          var namespace = '/dynamic';
-          sio.useNamespaceValidator(function(nsp, next) {
-            expect(nsp).to.be(namespace);
-            next(new Error(), true);
-          });
-          sio.on('connect', function(socket) {
-            if (socket.nsp.name === namespace) {
-              expect().fail();
-            }
-          });
-
-          var dynamic = client(srv,namespace);
-          dynamic.on('connect', function(){
-            expect().fail();
-          });
-          dynamic.on('error', function(err) {
-            expect(err).to.be("Invalid namespace");
-            done();
-          });
-        });
-      });
-    });
   });
 
   describe('socket', function(){