diff --git a/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php b/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
index 115ad5cf504e0..5dd3889e8eb15 100644
--- a/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
+++ b/src/Symfony/Bridge/Doctrine/Security/User/EntityUserProvider.php
@@ -62,7 +62,10 @@ public function loadUserByUsername($username)
         }
 
         if (null === $user) {
-            throw new UsernameNotFoundException(sprintf('User "%s" not found.', $username));
+            $e = new UsernameNotFoundException(sprintf('User "%s" not found.', $username));
+            $e->setUsername($username);
+
+            throw $e;
         }
 
         return $user;
@@ -92,7 +95,10 @@ public function refreshUser(UserInterface $user)
 
             $refreshedUser = $repository->find($id);
             if (null === $refreshedUser) {
-                throw new UsernameNotFoundException('User with id '.json_encode($id).' not found.');
+                $e = new UsernameNotFoundException('User with id '.json_encode($id).' not found.');
+                $e->setUsername(json_encode($id));
+
+                throw $e;
             }
         }
 
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/SecuredPageBundle/Security/Core/User/ArrayUserProvider.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/SecuredPageBundle/Security/Core/User/ArrayUserProvider.php
index 5b50def554a5d..fe12ea90f1469 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/SecuredPageBundle/Security/Core/User/ArrayUserProvider.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/Bundle/SecuredPageBundle/Security/Core/User/ArrayUserProvider.php
@@ -34,7 +34,10 @@ public function loadUserByUsername($username)
         $user = $this->getUser($username);
 
         if (null === $user) {
-            throw new UsernameNotFoundException(sprintf('User "%s" not found.', $username));
+            $e = new UsernameNotFoundException(sprintf('User "%s" not found.', $username));
+            $e->setUsername($username);
+
+            throw $e;
         }
 
         return $user;
diff --git a/src/Symfony/Component/Ldap/Security/LdapUserProvider.php b/src/Symfony/Component/Ldap/Security/LdapUserProvider.php
index cf7e9b39f2bec..bbdbc570bc730 100644
--- a/src/Symfony/Component/Ldap/Security/LdapUserProvider.php
+++ b/src/Symfony/Component/Ldap/Security/LdapUserProvider.php
@@ -73,18 +73,27 @@ public function loadUserByUsername($username)
             $query = str_replace('{username}', $username, $this->defaultSearch);
             $search = $this->ldap->query($this->baseDn, $query);
         } catch (ConnectionException $e) {
-            throw new UsernameNotFoundException(sprintf('User "%s" not found.', $username), 0, $e);
+            $e = new UsernameNotFoundException(sprintf('User "%s" not found.', $username), 0, $e);
+            $e->setUsername($username);
+
+            throw $e;
         }
 
         $entries = $search->execute();
         $count = \count($entries);
 
         if (!$count) {
-            throw new UsernameNotFoundException(sprintf('User "%s" not found.', $username));
+            $e = new UsernameNotFoundException(sprintf('User "%s" not found.', $username));
+            $e->setUsername($username);
+
+            throw $e;
         }
 
         if ($count > 1) {
-            throw new UsernameNotFoundException('More than one user found.');
+            $e = new UsernameNotFoundException('More than one user found.');
+            $e->setUsername($username);
+
+            throw $e;
         }
 
         $entry = $entries[0];
diff --git a/src/Symfony/Component/Security/Guard/Provider/GuardAuthenticationProvider.php b/src/Symfony/Component/Security/Guard/Provider/GuardAuthenticationProvider.php
index a34c2db76cb4d..3467a32cef50a 100644
--- a/src/Symfony/Component/Security/Guard/Provider/GuardAuthenticationProvider.php
+++ b/src/Symfony/Component/Security/Guard/Provider/GuardAuthenticationProvider.php
@@ -105,7 +105,10 @@ private function authenticateViaGuard(AuthenticatorInterface $guardAuthenticator
         $user = $guardAuthenticator->getUser($token->getCredentials(), $this->userProvider);
 
         if (null === $user) {
-            throw new UsernameNotFoundException(sprintf('Null returned from "%s::getUser()".', \get_class($guardAuthenticator)));
+            $e = new UsernameNotFoundException(sprintf('Null returned from "%s::getUser()".', \get_class($guardAuthenticator)));
+            $e->setUsername($token->getUsername());
+
+            throw $e;
         }
 
         if (!$user instanceof UserInterface) {