diff --git a/oa-basic/lib/omniauth/strategies/http_basic.rb b/oa-basic/lib/omniauth/strategies/http_basic.rb
index 86aabdd..a89a05a 100644
--- a/oa-basic/lib/omniauth/strategies/http_basic.rb
+++ b/oa-basic/lib/omniauth/strategies/http_basic.rb
@@ -40,8 +40,8 @@ module OmniAuth
         @env['PATH_INFO'] = "#{OmniAuth.config.path_prefix}/#{name}/callback"
 
         @app.call(@env)
-      rescue RestClient::Request::Unauthorized
-        fail!(:invalid_credentials)
+      rescue RestClient::Request::Unauthorized => e
+        fail!(:invalid_credentials, e)
       end
       
       def perform_authentication(uri, headers = request_headers)
diff --git a/oa-core/lib/omniauth/builder.rb b/oa-core/lib/omniauth/builder.rb
index 89907b4..9be8861 100644
--- a/oa-core/lib/omniauth/builder.rb
+++ b/oa-core/lib/omniauth/builder.rb
@@ -7,6 +7,14 @@ module OmniAuth
       super(&block)
     end
     
+    def on_failure(&block)
+      OmniAuth.config.on_failure = block
+    end
+    
+    def configure(&block)
+      OmniAuth.configure(&block)
+    end
+    
     def provider(klass, *args, &block)
       if klass.is_a?(Class)
         middleware = klass
diff --git a/oa-core/lib/omniauth/strategy.rb b/oa-core/lib/omniauth/strategy.rb
index 6d74f39..56e0da6 100644
--- a/oa-core/lib/omniauth/strategy.rb
+++ b/oa-core/lib/omniauth/strategy.rb
@@ -77,7 +77,8 @@ module OmniAuth
     
     def user_info; {} end
     
-    def fail!(message_key)
+    def fail!(message_key, exception = nil)
+      self.env['rack.auth.error'] = exception
       OmniAuth.config.on_failure.call(self.env, message_key.to_sym)
     end
   end
diff --git a/oa-enterprise/lib/omniauth/strategies/ldap.rb b/oa-enterprise/lib/omniauth/strategies/ldap.rb
index f44e0ff..7167f60 100644
--- a/oa-enterprise/lib/omniauth/strategies/ldap.rb
+++ b/oa-enterprise/lib/omniauth/strategies/ldap.rb
@@ -50,8 +50,7 @@ module OmniAuth
 	
 	        @app.call(@env)
       	rescue Exception => e
-      		puts e.message
-      		fail!(:invalid_credentials)
+      		fail!(:invalid_credentials, e)
       	end
       end      
 
diff --git a/oa-oauth/lib/omniauth/strategies/oauth.rb b/oa-oauth/lib/omniauth/strategies/oauth.rb
index e3102d7..d8e6b05 100644
--- a/oa-oauth/lib/omniauth/strategies/oauth.rb
+++ b/oa-oauth/lib/omniauth/strategies/oauth.rb
@@ -24,8 +24,8 @@ module OmniAuth
         request_token = ::OAuth::RequestToken.new(consumer, session[:oauth][name.to_sym].delete(:request_token), session[:oauth][name.to_sym].delete(:request_secret))
         @access_token = request_token.get_access_token(:oauth_verifier => request.params['oauth_verifier'])
         super
-      rescue ::OAuth::Unauthorized
-        fail!(:invalid_credentials)
+      rescue ::OAuth::Unauthorized => e
+        fail!(:invalid_credentials, e)
       end
       
       def auth_hash
diff --git a/oa-oauth/lib/omniauth/strategies/oauth2.rb b/oa-oauth/lib/omniauth/strategies/oauth2.rb
index 1084f6a..cbd3982 100644
--- a/oa-oauth/lib/omniauth/strategies/oauth2.rb
+++ b/oa-oauth/lib/omniauth/strategies/oauth2.rb
@@ -26,8 +26,8 @@ module OmniAuth
         verifier = request.params['code']
         @access_token = client.web_server.get_access_token(verifier, :redirect_uri => callback_url)
         super
-      rescue ::OAuth2::HTTPError => e
-        fail!(:invalid_credentials)
+      rescue ::OAuth2::HTTPError, ::OAuth2::AccessDenied => e
+        fail!(:invalid_credentials, e)
       end
       
       def auth_hash
diff --git a/oa-oauth/lib/omniauth/strategies/twitter.rb b/oa-oauth/lib/omniauth/strategies/twitter.rb
index 097d350..7172792 100644
--- a/oa-oauth/lib/omniauth/strategies/twitter.rb
+++ b/oa-oauth/lib/omniauth/strategies/twitter.rb
@@ -14,7 +14,8 @@ module OmniAuth
     class Twitter < OmniAuth::Strategies::OAuth
       def initialize(app, consumer_key, consumer_secret)
         super(app, :twitter, consumer_key, consumer_secret,
-                :site => 'https://api.twitter.com')
+                :site => 'https://api.twitter.com',
+                :authorize_path => '/oauth/authenticate')
       end
       
       def auth_hash