diff --git a/composer.json b/composer.json
index 2f965d0740..dbceff5d31 100644
--- a/composer.json
+++ b/composer.json
@@ -72,7 +72,7 @@
         "monolog/monolog": "~1.3",
         "propel/propel1": "~1.6",
         "ircmaxell/password-compat": "~1.0",
-        "ocramius/proxy-manager": ">=0.3.1,<0.6-dev",
+        "ocramius/proxy-manager": "~0.3.1",
         "egulias/email-validator": "~1.2"
     },
     "autoload": {
diff --git a/src/Symfony/Bridge/ProxyManager/composer.json b/src/Symfony/Bridge/ProxyManager/composer.json
index 94446014ad..d79d39cd93 100644
--- a/src/Symfony/Bridge/ProxyManager/composer.json
+++ b/src/Symfony/Bridge/ProxyManager/composer.json
@@ -18,7 +18,7 @@
     "require": {
         "php": ">=5.3.3",
         "symfony/dependency-injection": "~2.3",
-        "ocramius/proxy-manager": ">=0.3.1,<0.6-dev"
+        "ocramius/proxy-manager": "~0.3.1"
     },
     "require-dev": {
         "symfony/config": "~2.3"
diff --git a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
index 98c99b1825..78a10c8223 100644
--- a/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
+++ b/src/Symfony/Bundle/SecurityBundle/DependencyInjection/SecurityExtension.php
@@ -511,6 +511,7 @@ class SecurityExtension extends Extension
     {
         $name = $this->getUserProviderId(strtolower($name));
 
+        // Doctrine Entity and In-memory DAO provider are managed by factories
         foreach ($this->userProviderFactories as $factory) {
             $key = str_replace('-', '_', $factory->getKey());
 
@@ -537,37 +538,12 @@ class SecurityExtension extends Extension
 
             $container
                 ->setDefinition($name, new DefinitionDecorator('security.user.provider.chain'))
-                ->addArgument($providers)
-            ;
+                ->addArgument($providers);
 
             return $name;
         }
 
-        // Doctrine Entity DAO provider
-        if (isset($provider['entity'])) {
-            $container
-                ->setDefinition($name, new DefinitionDecorator('security.user.provider.entity'))
-                ->addArgument($provider['entity']['class'])
-                ->addArgument($provider['entity']['property'])
-            ;
-
-            return $name;
-        }
-
-        // In-memory DAO provider
-        $definition = $container->setDefinition($name, new DefinitionDecorator('security.user.provider.in_memory'));
-        foreach ($provider['users'] as $username => $user) {
-            $userId = $name.'_'.$username;
-
-            $container
-                ->setDefinition($userId, new DefinitionDecorator('security.user.provider.in_memory.user'))
-                ->setArguments(array($username, (string) $user['password'], $user['roles']))
-            ;
-
-            $definition->addMethodCall('createUser', array(new Reference($userId)));
-        }
-
-        return $name;
+        throw new InvalidConfigurationException(sprintf('Unable to create definition for "%s" user provider', $name));
     }
 
     private function getUserProviderId($name)
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Fixtures/UserProvider/DummyProvider.php b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Fixtures/UserProvider/DummyProvider.php
new file mode 100644
index 0000000000..f40f11c3cc
--- /dev/null
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/Fixtures/UserProvider/DummyProvider.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Symfony\Bundle\SecurityBundle\Tests\DependencyInjection\Fixtures\UserProvider;
+
+use Symfony\Bundle\SecurityBundle\DependencyInjection\Security\UserProvider\UserProviderFactoryInterface;
+use Symfony\Component\Config\Definition\Builder\NodeDefinition;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+
+class DummyProvider implements UserProviderFactoryInterface
+{
+    public function create(ContainerBuilder $container, $id, $config)
+    {
+        
+    }
+
+    public function getKey()
+    {
+        return 'foo';
+    }
+
+    public function addConfiguration(NodeDefinition $node)
+    {
+        
+    }
+}
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/SecurityExtensionTest.php b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/SecurityExtensionTest.php
index b63a0563a5..1898056703 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/SecurityExtensionTest.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/DependencyInjection/SecurityExtensionTest.php
@@ -13,6 +13,7 @@ namespace Symfony\Bundle\SecurityBundle\Tests\DependencyInjection;
 
 use Symfony\Bundle\SecurityBundle\DependencyInjection\SecurityExtension;
 use Symfony\Bundle\SecurityBundle\SecurityBundle;
+use Symfony\Bundle\SecurityBundle\Tests\DependencyInjection\Fixtures\UserProvider\DummyProvider;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 
 class SecurityExtensionTest extends \PHPUnit_Framework_TestCase
@@ -66,6 +67,33 @@ class SecurityExtensionTest extends \PHPUnit_Framework_TestCase
         $container->compile();
     }
 
+    /**
+     * @expectedException \Symfony\Component\Config\Definition\Exception\InvalidConfigurationException
+     * @expectedExceptionMessage Unable to create definition for "security.user.provider.concrete.my_foo" user provider
+     */
+    public function testFirewallWithInvalidUserProvider()
+    {
+        $container = $this->getRawContainer();
+
+        $extension = $container->getExtension('security');
+        $extension->addUserProviderFactory(new DummyProvider());
+
+        $container->loadFromExtension('security', array(
+            'providers' => array(
+                'my_foo' => array('foo' => []),
+            ),
+
+            'firewalls' => array(
+                'some_firewall' => array(
+                    'pattern' => '/.*',
+                    'http_basic' => [],
+                ),
+            ),
+        ));
+
+        $container->compile();
+    }
+
     protected function getRawContainer()
     {
         $container = new ContainerBuilder();
diff --git a/src/Symfony/Component/Filesystem/Filesystem.php b/src/Symfony/Component/Filesystem/Filesystem.php
index 397aede3ff..894b9703c0 100644
--- a/src/Symfony/Component/Filesystem/Filesystem.php
+++ b/src/Symfony/Component/Filesystem/Filesystem.php
@@ -408,7 +408,7 @@ class Filesystem
                 }
             } else {
                 if (is_link($file)) {
-                    $this->symlink($file->getLinkTarget(), $target);
+                    $this->symlink($file->getRealPath(), $target);
                 } elseif (is_dir($file)) {
                     $this->mkdir($target);
                 } elseif (is_file($file)) {
diff --git a/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php b/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
index 5be5686278..deb6ee57b6 100644
--- a/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
+++ b/src/Symfony/Component/Filesystem/Tests/FilesystemTest.php
@@ -853,6 +853,31 @@ class FilesystemTest extends FilesystemTestCase
         $this->assertTrue(is_link($targetPath.DIRECTORY_SEPARATOR.'link1'));
     }
 
+    public function testMirrorCopiesRelativeLinkedContents()
+    {
+        $this->markAsSkippedIfSymlinkIsMissing();
+
+        $sourcePath = $this->workspace.DIRECTORY_SEPARATOR.'source'.DIRECTORY_SEPARATOR;
+        $oldPath = getcwd();
+
+        mkdir($sourcePath.'nested/', 0777, true);
+        file_put_contents($sourcePath.'/nested/file1.txt', 'FILE1');
+        // Note: Create relative symlink
+        chdir($sourcePath);
+        symlink('nested', 'link1');
+
+        chdir($oldPath);
+
+        $targetPath = $this->workspace.DIRECTORY_SEPARATOR.'target'.DIRECTORY_SEPARATOR;
+
+        $this->filesystem->mirror($sourcePath, $targetPath);
+
+        $this->assertTrue(is_dir($targetPath));
+        $this->assertFileEquals($sourcePath.'/nested/file1.txt', $targetPath.DIRECTORY_SEPARATOR.'link1/file1.txt');
+        $this->assertTrue(is_link($targetPath.DIRECTORY_SEPARATOR.'link1'));
+        $this->assertEquals($sourcePath.'nested', readlink($targetPath.DIRECTORY_SEPARATOR.'link1'));
+    }
+
     /**
      * @dataProvider providePathsForIsAbsolutePath
      */