diff --git a/apps/assets/templates/assets/asset_create.html b/apps/assets/templates/assets/asset_create.html
index eca0f6a03..99703d2e3 100644
--- a/apps/assets/templates/assets/asset_create.html
+++ b/apps/assets/templates/assets/asset_create.html
@@ -15,9 +15,9 @@
     {% csrf_token %}
     <h3>{% trans 'Basic' %}</h3>
     {% bootstrap_field form.hostname layout="horizontal" %}
+    {% bootstrap_field form.platform layout="horizontal" %}
     {% bootstrap_field form.ip layout="horizontal" %}
     {% bootstrap_field form.port layout="horizontal" %}
-    {% bootstrap_field form.platform layout="horizontal" %}
     {% bootstrap_field form.public_ip layout="horizontal" %}
     {% bootstrap_field form.domain layout="horizontal" %}
 
@@ -85,6 +85,17 @@ $(document).ready(function () {
         allowClear: true,
         templateSelection: format
     });
+    $("#id_platform").change(function (){
+        var platform = $("#id_platform option:selected").text();
+        var port = 22;
+        if(platform === 'Windows'){
+            port = 3389;
+        }
+        if(platform === 'Other'){
+            port = null;
+        }
+        $("#id_port").val(port);
+    });
 })
 </script>
 {% endblock %}
\ No newline at end of file
diff --git a/apps/assets/views/asset.py b/apps/assets/views/asset.py
index 306a26a0a..273323193 100644
--- a/apps/assets/views/asset.py
+++ b/apps/assets/views/asset.py
@@ -304,7 +304,10 @@ class BulkImportAssetView(AdminUserRequiredMixin, JSONResponseMixin, FormView):
                 if v != '':
                     asset_dict[k] = v
 
-            asset = get_object_or_none(Asset, id=asset_dict.pop('id', 0))
+            asset = None
+            asset_id = asset_dict.pop('id', None)
+            if asset_id:
+                asset = get_object_or_none(Asset, id=asset_id)
             if not asset:
                 try:
                     if len(Asset.objects.filter(hostname=asset_dict.get('hostname'))):
diff --git a/apps/templates/_message.html b/apps/templates/_message.html
index 9c64a441f..4c37cc138 100644
--- a/apps/templates/_message.html
+++ b/apps/templates/_message.html
@@ -7,7 +7,7 @@
         Your information was incomplete. Please click <a href="{{ first_login_url }}"> this link </a>to complete your information.
         {% endblocktrans %}
 
-        <button aria-hidden="true" data-dismiss="alert" class="close" type="button">×</button>
+        <button aria-hidden="true" data-dismiss="alert" class="close" type="button" style="outline: none;">×</button>
     </div>
     {% endif %}
 {% endblock %}
@@ -28,7 +28,9 @@
     {% for message in messages %}
         <div class="alert alert-{{ message.tags }} help-message" >
             {{ message|safe }}
+            <button aria-hidden="true" data-dismiss="alert" class="close" type="button" style="outline: none;">×</button>
         </div>
+
     {% endfor %}
 {% endif %}
 
diff --git a/apps/users/forms.py b/apps/users/forms.py
index f6c02ff23..f777e0dd7 100644
--- a/apps/users/forms.py
+++ b/apps/users/forms.py
@@ -15,6 +15,14 @@ class UserLoginForm(AuthenticationForm):
         label=_('Password'), widget=forms.PasswordInput,
         max_length=128, strip=False
     )
+
+
+class UserLoginCaptchaForm(AuthenticationForm):
+    username = forms.CharField(label=_('Username'), max_length=100)
+    password = forms.CharField(
+        label=_('Password'), widget=forms.PasswordInput,
+        max_length=128, strip=False
+    )
     captcha = CaptchaField()
 
 
diff --git a/apps/users/templates/users/login.html b/apps/users/templates/users/login.html
index 13276f6fe..7dd3f5d0a 100644
--- a/apps/users/templates/users/login.html
+++ b/apps/users/templates/users/login.html
@@ -53,7 +53,7 @@
                             {% endif %}
                         {% endif %}
                         <div class="form-group">
-                            <input type="text" class="form-control" name="{{ form.username.html_name }}" placeholder="{% trans 'Username' %}" required="">
+                            <input type="text" class="form-control" name="{{ form.username.html_name }}" placeholder="{% trans 'Username' %}" required="" value="{% if form.username.value %}{{ form.username.value }}{% endif %}">
                         </div>
                         <div class="form-group">
                             <input type="password" class="form-control" name="{{ form.password.html_name }}" placeholder="{% trans 'Password' %}" required="">
diff --git a/apps/users/templates/users/user_list.html b/apps/users/templates/users/user_list.html
index 0902c3e73..c7c9b8b28 100644
--- a/apps/users/templates/users/user_list.html
+++ b/apps/users/templates/users/user_list.html
@@ -107,6 +107,9 @@ $(document).ready(function(){
     $('.btn_export').click(function () {
         var users = [];
         var rows = table.rows('.selected').data();
+        if(rows.length===0){
+            rows = table.rows().data();
+        }
         $.each(rows, function (index, obj) {
             users.push(obj.id)
         });
diff --git a/apps/users/views/login.py b/apps/users/views/login.py
index bb7f58874..7e3d50c8a 100644
--- a/apps/users/views/login.py
+++ b/apps/users/views/login.py
@@ -2,6 +2,7 @@
 
 from __future__ import unicode_literals
 import os
+from django.core.cache import cache
 from django.shortcuts import render
 from django.contrib.auth import login as auth_login, logout as auth_logout
 from django.contrib.auth.mixins import LoginRequiredMixin
@@ -43,7 +44,9 @@ __all__ = [
 class UserLoginView(FormView):
     template_name = 'users/login.html'
     form_class = forms.UserLoginForm
+    form_class_captcha = forms.UserLoginCaptchaForm
     redirect_field_name = 'next'
+    key_prefix = "_LOGIN_INVALID_{}"
 
     def get(self, request, *args, **kwargs):
         if request.user.is_staff:
@@ -58,6 +61,21 @@ class UserLoginView(FormView):
         set_tmp_user_to_cache(self.request, form.get_user())
         return redirect(self.get_success_url())
 
+    def form_invalid(self, form):
+        ip = get_login_ip(self.request)
+        cache.set(self.key_prefix.format(ip), 1, 3600)
+        old_form = form
+        form = self.form_class_captcha(data=form.data)
+        form._errors = old_form.errors
+        return super().form_invalid(form)
+
+    def get_form_class(self):
+        ip = get_login_ip(self.request)
+        if cache.get(self.key_prefix.format(ip)):
+            return self.form_class_captcha
+        else:
+            return self.form_class
+
     def get_success_url(self):
         user = get_user_or_tmp_user(self.request)