diff --git a/apps/protocols/http/mode/expectedcontent.pm b/apps/protocols/http/mode/expectedcontent.pm
index 47a79b8b8..4674fbf1f 100644
--- a/apps/protocols/http/mode/expectedcontent.pm
+++ b/apps/protocols/http/mode/expectedcontent.pm
@@ -198,10 +198,6 @@ Set path to get Webpage (Default: '/')
 
 Specify this option if you access webpage over basic authentication
 
-=item B<--ntlm>
-
-Specify this option if you access webpage over ntlm authentication (Use with --credentials option)
-
 =item B<--ntlmv2>
 
 Specify this option if you access webpage over ntlmv2 authentication (Use with --credentials and --port options)
diff --git a/apps/protocols/http/mode/jsoncontent.pm b/apps/protocols/http/mode/jsoncontent.pm
index 6f21c23b1..70c241be3 100644
--- a/apps/protocols/http/mode/jsoncontent.pm
+++ b/apps/protocols/http/mode/jsoncontent.pm
@@ -395,10 +395,6 @@ Set path to get Webpage (Default: '/')
 
 Specify this option if you access webpage over basic authentication
 
-=item B<--ntlm>
-
-Specify this option if you access webpage over ntlm authentication (Use with --credentials option)
-
 =item B<--ntlmv2>
 
 Specify this option if you access webpage over ntlmv2 authentication (Use with --credentials and --port options)
diff --git a/apps/protocols/http/mode/response.pm b/apps/protocols/http/mode/response.pm
index 4ca6a58b3..b60bc2258 100644
--- a/apps/protocols/http/mode/response.pm
+++ b/apps/protocols/http/mode/response.pm
@@ -176,10 +176,6 @@ Set path to get webpage (Default: '/')
 
 Specify this option if you access webpage over basic authentication
 
-=item B<--ntlm>
-
-Specify this option if you access webpage over ntlm authentication (Use with --credentials option)
-
 =item B<--ntlmv2>
 
 Specify this option if you access webpage over ntlmv2 authentication (Use with --credentials and --port options)
diff --git a/apps/protocols/http/mode/soapcontent.pm b/apps/protocols/http/mode/soapcontent.pm
index 53d085650..9d0084cd1 100644
--- a/apps/protocols/http/mode/soapcontent.pm
+++ b/apps/protocols/http/mode/soapcontent.pm
@@ -422,10 +422,6 @@ Set path to get Webpage (Default: '/')
 
 Specify this option if you access webpage over basic authentication
 
-=item B<--ntlm>
-
-Specify this option if you access webpage over ntlm authentication (Use with --credentials option)
-
 =item B<--ntlmv2>
 
 Specify this option if you access webpage over ntlmv2 authentication (Use with --credentials and --port options)
diff --git a/centreon/plugins/http.pm b/centreon/plugins/http.pm
index 9a5762eeb..681b9124e 100644
--- a/centreon/plugins/http.pm
+++ b/centreon/plugins/http.pm
@@ -22,7 +22,7 @@ package centreon::plugins::http;
 
 use strict;
 use warnings;
-use LWP::UserAgent;
+use centreon::plugins::useragent;
 use HTTP::Cookies;
 use URI;
 use IO::Socket::SSL;
@@ -211,7 +211,8 @@ sub request {
     $self->check_options(request => $request_options);
 
     if (!defined($self->{ua})) {
-        $self->{ua} = LWP::UserAgent->new(keep_alive => 1, protocols_allowed => ['http', 'https'], timeout => $request_options->{timeout});
+        $self->{ua} = centreon::plugins::useragent->new(keep_alive => 1, protocols_allowed => ['http', 'https'], timeout => $request_options->{timeout},
+                                                        credentials => $request_options->{credentials}, username => $request_options->{username}, password => $request_options->{password});
         if (defined($request_options->{cookies_file})) {
             $self->{ua}->cookie_jar(HTTP::Cookies->new(file => $request_options->{cookies_file},
                                                        autosave => 1));
@@ -264,16 +265,11 @@ sub request {
             $req->content($uri_post->query);
         }
     }
-    
-    if (defined($request_options->{credentials}) && defined($request_options->{ntlm})) {
-        $self->{ua}->credentials($request_options->{hostname} . ':' . $request_options->{port}, '', $request_options->{username}, $request_options->{password});
-    } elsif (defined($request_options->{credentials}) && defined($request_options->{ntlmv2})) {
+        
+    if (defined($request_options->{credentials}) && defined($request_options->{ntlmv2})) {
         centreon::plugins::misc::mymodule_load(output => $self->{output}, module => 'Authen::NTLM',
                                                error_msg => "Cannot load module 'Authen::NTLM'.");
         Authen::NTLM::ntlmv2(1);
-        $self->{ua}->credentials($request_options->{hostname} . ':' . $request_options->{port}, '', $request_options->{username}, $request_options->{password});
-    } elsif (defined($request_options->{credentials})) {
-        $req->authorization_basic($request_options->{username}, $request_options->{password});
     }
 
     $self->set_proxy(request => $request_options, url => $url);
@@ -316,9 +312,15 @@ sub request {
     }
 
     if (!$self->{output}->is_status(value => $status, compare => 'ok', litteral => 1)) {
+        my $short_msg = $response->status_line;
+        if ($short_msg =~ /^401/) {
+            my ($authenticate) = $response->www_authenticate =~ /(\S+)/;
+            $short_msg .= ' (' . $authenticate . ' authentification expected)';
+        }
+
         $self->{output}->output_add(long_msg => $response->content, debug => 1);
         $self->{output}->output_add(severity => $status,
-                                    short_msg => $response->status_line);
+                                    short_msg => $short_msg);
         $self->{output}->display();
         $self->{output}->exit();
     }
diff --git a/centreon/plugins/useragent.pm b/centreon/plugins/useragent.pm
new file mode 100644
index 000000000..5eca396e9
--- /dev/null
+++ b/centreon/plugins/useragent.pm
@@ -0,0 +1,50 @@
+#
+# Copyright 2017 Centreon (http://www.centreon.com/)
+#
+# Centreon is a full-fledged industry-strength solution that meets
+# the needs in IT infrastructure and application monitoring for
+# service performance.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+package centreon::plugins::useragent;
+
+use strict;
+use warnings;
+use base 'LWP::UserAgent';
+
+sub new {
+    my ($class, %options) = @_;
+    my $self  = {};
+    bless $self, $class;
+
+    $self = LWP::UserAgent::new(@_);
+    $self->agent("centreon::plugins::useragent");
+
+    $self->{credentials} = $options{credentials} if defined($options{credentials});
+    $self->{username} = $options{username} if defined($options{username});
+    $self->{password} = $options{password} if defined($options{password});
+
+    return $self;
+}
+
+sub get_basic_credentials {
+    my($self, $realm, $uri, $proxy) = @_;
+    return if $proxy;
+    return $self->{username}, $self->{password} if $self->{credentials} and wantarray;
+    return $self->{username}.":".$self->{password} if $self->{credentials};
+    return undef;
+}
+
+1;