diff --git a/app/assets/stylesheets/generic/common.scss b/app/assets/stylesheets/generic/common.scss
index bd2dcefce1a..b9942b5cb5d 100644
--- a/app/assets/stylesheets/generic/common.scss
+++ b/app/assets/stylesheets/generic/common.scss
@@ -257,13 +257,6 @@ li.note {
   }
 }
 
-h1.http_status_code {
-  font-size: 56px;
-  line-height: 100px;
-  font-weight: normal;
-  color: #456;
-}
-
 .control-group {
   .controls {
     span {
diff --git a/app/assets/stylesheets/sections/errors.scss b/app/assets/stylesheets/sections/errors.scss
new file mode 100644
index 00000000000..32d2d7b1dbf
--- /dev/null
+++ b/app/assets/stylesheets/sections/errors.scss
@@ -0,0 +1,14 @@
+.error-page {
+  max-width: 400px;
+  margin: 0 auto;
+
+  h1, h2, h3 {
+    text-align: center;
+  }
+
+  h1 {
+    font-size: 56px;
+    line-height: 100px;
+    font-weight: 300;
+  }
+}
diff --git a/app/controllers/omniauth_callbacks_controller.rb b/app/controllers/omniauth_callbacks_controller.rb
index 0c87fe0d9ae..ef2afec52dc 100644
--- a/app/controllers/omniauth_callbacks_controller.rb
+++ b/app/controllers/omniauth_callbacks_controller.rb
@@ -31,6 +31,12 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
     end
   end
 
+  def omniauth_error
+    @provider = params[:provider]
+    @error = params[:error]
+    render 'errors/omniauth_error', layout: "errors", status: 422
+  end
+
   private
 
   def handle_omniauth
@@ -45,14 +51,19 @@ class OmniauthCallbacksController < Devise::OmniauthCallbacksController
 
       # Create user if does not exist
       # and allow_single_sign_on is true
-      if Gitlab.config.omniauth['allow_single_sign_on']
-        @user ||= Gitlab::OAuth::User.create(oauth)
+      if Gitlab.config.omniauth['allow_single_sign_on'] && !@user
+        @user, errors = Gitlab::OAuth::User.create(oauth)
       end
 
-      if @user
+      if @user && !errors
         sign_in_and_redirect(@user)
       else
-        flash[:notice] = "There's no such user!"
+        if errors
+          error_message = errors.map{ |attribute, message| "#{attribute} #{message}" }.join(", ")
+          redirect_to omniauth_error_path(oauth['provider'], error: error_message) and return
+        else
+          flash[:notice] = "There's no such user!"
+        end
         redirect_to new_user_session_path
       end
     end
diff --git a/app/views/errors/access_denied.html.haml b/app/views/errors/access_denied.html.haml
index e005a7c4409..a1d8664c4ce 100644
--- a/app/views/errors/access_denied.html.haml
+++ b/app/views/errors/access_denied.html.haml
@@ -1,5 +1,5 @@
-%h1.http_status_code 403
-%h3.page-title Access Denied
+%h1 403
+%h3 Access Denied
 %hr
 %p You are not allowed to access this page.
 %p Read more about project permissions #{link_to "here", help_page_path("permissions", "permissions"), class: "vlink"}
diff --git a/app/views/errors/encoding.html.haml b/app/views/errors/encoding.html.haml
index 7021f06dd7f..64c7451a8da 100644
--- a/app/views/errors/encoding.html.haml
+++ b/app/views/errors/encoding.html.haml
@@ -1,4 +1,4 @@
-%h1.http_status_code 500
-%h3.page-title Encoding Error
+%h1 500
+%h3 Encoding Error
 %hr
 %p Page can't be loaded because of an encoding error.
diff --git a/app/views/errors/git_not_found.html.haml b/app/views/errors/git_not_found.html.haml
index d8ed7773207..189e53bca55 100644
--- a/app/views/errors/git_not_found.html.haml
+++ b/app/views/errors/git_not_found.html.haml
@@ -1,5 +1,5 @@
-%h1.http_status_code 404
-%h3.page-title Git Resource Not found
+%h1 404
+%h3 Git Resource Not found
 %hr
 %p
   Application can't get access to some branch or commit in your repository. It
diff --git a/app/views/errors/not_found.html.haml b/app/views/errors/not_found.html.haml
index 4b97ddefc72..7bf88f592cf 100644
--- a/app/views/errors/not_found.html.haml
+++ b/app/views/errors/not_found.html.haml
@@ -1,4 +1,4 @@
-%h1.http_status_code 404
-%h3.page-title The resource you were looking for doesn't exist.
+%h1 404
+%h3 The resource you were looking for doesn't exist.
 %hr
 %p You may have mistyped the address or the page may have moved.
diff --git a/app/views/errors/omniauth_error.html.haml b/app/views/errors/omniauth_error.html.haml
new file mode 100644
index 00000000000..f3c8221a9d9
--- /dev/null
+++ b/app/views/errors/omniauth_error.html.haml
@@ -0,0 +1,12 @@
+%h1 422
+%h3 Sign-in using #{@provider} auth failed
+%hr
+%p Sign-in failed because #{@error}.
+%p There are couple of steps you can take:
+
+%ul
+  %li Try logging in using your email
+  %li Try logging in using your username
+  %li If you have forgotten your password, try recovering it using #{ link_to "Password recovery", new_password_path(resource_name) }
+
+%p If none of the options work, try contacting the GitLab administrator.
diff --git a/app/views/layouts/errors.html.haml b/app/views/layouts/errors.html.haml
index 3e05746f837..d0e276d751a 100644
--- a/app/views/layouts/errors.html.haml
+++ b/app/views/layouts/errors.html.haml
@@ -4,7 +4,6 @@
   %body{class: "#{app_theme} application"}
     = render "layouts/head_panel", title: "" if current_user
     = render "layouts/flash"
-    .container
-      .content
-        .center.padded.prepend-top-20
-          = yield
+    .container.navless-container
+      .error-page
+        = yield
diff --git a/config/routes.rb b/config/routes.rb
index 5b854ed20b9..14ff52f387a 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -160,6 +160,9 @@ Gitlab::Application.routes.draw do
 
   devise_for :users, controllers: { omniauth_callbacks: :omniauth_callbacks, registrations: :registrations , passwords: :passwords, sessions: :users_sessions }
 
+  devise_scope :user do
+    get "/users/auth/:provider/omniauth_error" => "omniauth_callbacks#omniauth_error", as: :omniauth_error
+  end
   #
   # Project Area
   #
diff --git a/lib/gitlab/oauth/user.rb b/lib/gitlab/oauth/user.rb
index c5be884a895..38e33c0eee5 100644
--- a/lib/gitlab/oauth/user.rb
+++ b/lib/gitlab/oauth/user.rb
@@ -44,7 +44,13 @@ module Gitlab
             user.username = email_username.gsub("'", "")
           end
 
-          user.save!
+          begin
+            user.save!
+          rescue ActiveRecord::RecordInvalid => e
+            log.info "(OAuth) Email #{e.record.errors[:email]}. Username #{e.record.errors[:username]}"
+            return nil, e.record.errors
+          end
+
           log.info "(OAuth) Creating user #{email} from login with extern_uid => #{uid}"
 
           if Gitlab.config.omniauth['block_auto_created_users'] && !ldap?