diff --git a/gns3server/handlers/api/project_handler.py b/gns3server/handlers/api/project_handler.py
index 49e795cf..866fddf1 100644
--- a/gns3server/handlers/api/project_handler.py
+++ b/gns3server/handlers/api/project_handler.py
@@ -19,6 +19,7 @@ import aiohttp
 import asyncio
 import json
 import os
+import psutil
 
 from ...web.route import Route
 from ...schemas.project import PROJECT_OBJECT_SCHEMA, PROJECT_CREATE_SCHEMA, PROJECT_UPDATE_SCHEMA, PROJECT_FILE_LIST_SCHEMA, PROJECT_LIST_SCHEMA
@@ -205,7 +206,7 @@ class ProjectHandler:
         queue = project.get_listen_queue()
         ProjectHandler._notifications_listening.setdefault(project.id, 0)
         ProjectHandler._notifications_listening[project.id] += 1
-        response.write("{\"action\": \"ping\"}\n".encode("utf-8"))
+        response.write("{}\n".format(json.dumps(ProjectHandler._getPingMessage())).encode("utf-8"))
         while True:
             try:
                 (action, msg) = yield from asyncio.wait_for(queue.get(), 5)
@@ -218,11 +219,26 @@ class ProjectHandler:
             except asyncio.futures.CancelledError as e:
                 break
             except asyncio.futures.TimeoutError:
-                response.write("{\"action\": \"ping\"}\n".encode("utf-8"))
+                response.write("{}\n".format(json.dumps(ProjectHandler._getPingMessage())).encode("utf-8"))
         project.stop_listen_queue(queue)
         if project.id in ProjectHandler._notifications_listening:
             ProjectHandler._notifications_listening[project.id] -= 1
 
+    @classmethod
+    def _getPingMessage(cls):
+        """
+        The ping message is regulary send to the client to
+        keep the connection open. We send with it some informations
+        about server load.
+
+        :returns: hash
+        """
+        stats = {}
+        # Non blocking call in order to get cpu usage. First call will return 0
+        stats["cpu_usage_percent"] = psutil.cpu_percent(interval=None)
+        stats["memory_usage_percent"] = psutil.virtual_memory().percent
+        return {"action": "ping", "event": stats}
+
     @classmethod
     @Route.get(
         r"/projects/{project_id}/files",
diff --git a/gns3server/modules/dynamips/__init__.py b/gns3server/modules/dynamips/__init__.py
index dafd9c0c..a246c564 100644
--- a/gns3server/modules/dynamips/__init__.py
+++ b/gns3server/modules/dynamips/__init__.py
@@ -458,9 +458,10 @@ class Dynamips(BaseManager):
             nio = NIOLinuxEthernet(node.hypervisor, ethernet_device)
         elif nio_settings["type"] == "nio_tap":
             tap_device = nio_settings["tap_device"]
+            nio = NIOTAP(node.hypervisor, tap_device)
             if not is_interface_up(tap_device):
+                # test after the TAP interface has been created (if it doesn't exist yet)
                 raise aiohttp.web.HTTPConflict(text="TAP interface {} is down".format(tap_device))
-            nio = NIOTAP(node.hypervisor, tap_device)
         elif nio_settings["type"] == "nio_unix":
             local_file = nio_settings["local_file"]
             remote_file = nio_settings["remote_file"]
diff --git a/gns3server/modules/qemu/__init__.py b/gns3server/modules/qemu/__init__.py
index 3ee441b0..7d7ddb58 100644
--- a/gns3server/modules/qemu/__init__.py
+++ b/gns3server/modules/qemu/__init__.py
@@ -49,21 +49,17 @@ class Qemu(BaseManager):
         """
         kvm = []
 
-        try:
-            process = yield from asyncio.create_subprocess_exec("kvm-ok")
-            yield from process.wait()
-        except OSError:
+        if not os.path.exists("/dev/kvm"):
             return kvm
 
-        if process.returncode == 0:
-            arch = platform.machine()
-            if arch == "x86_64":
-                kvm.append("x86_64")
-                kvm.append("i386")
-            elif arch == "i386":
-                kvm.append("i386")
-            else:
-                kvm.append(platform.machine())
+        arch = platform.machine()
+        if arch == "x86_64":
+            kvm.append("x86_64")
+            kvm.append("i386")
+        elif arch == "i386":
+            kvm.append("i386")
+        else:
+            kvm.append(platform.machine())
         return kvm
 
     @staticmethod
diff --git a/gns3server/modules/qemu/qemu_vm.py b/gns3server/modules/qemu/qemu_vm.py
index 24cbd41b..6a1995a1 100644
--- a/gns3server/modules/qemu/qemu_vm.py
+++ b/gns3server/modules/qemu/qemu_vm.py
@@ -80,10 +80,12 @@ class QemuVM(BaseVM):
             try:
                 self.qemu_path = qemu_path
             except QemuError as e:
+                # If the binary is not found for topologies 1.4 and later
+                # search via the platform otherwise use the binary name
                 if platform:
                     self.platform = platform
                 else:
-                    raise e
+                    self.qemu_path = os.path.basename(qemu_path)
         else:
             self.platform = platform
 
@@ -694,6 +696,8 @@ class QemuVM(BaseVM):
         log.info('QEMU VM "{name}" [{id}] has set the QEMU initrd path to {initrd}'.format(name=self._name,
                                                                                            id=self._id,
                                                                                            initrd=initrd))
+        if "asa" in initrd:
+            self.project.emit("log.warning", {"message": "Warning ASA 8 is not officialy supported by GNS3 and Cisco, we recommend to use ASAv. Depending of your hardware this could not work or you could be limited to one instance."})
         self._initrd = initrd
 
     @property
@@ -1498,7 +1502,6 @@ class QemuVM(BaseVM):
                     answer[field] = getattr(self, field)
                 except AttributeError:
                     pass
-
         answer["hda_disk_image"] = self.manager.get_relative_image_path(self._hda_disk_image)
         answer["hda_disk_image_md5sum"] = md5sum(self._hda_disk_image)
         answer["hdb_disk_image"] = self.manager.get_relative_image_path(self._hdb_disk_image)
diff --git a/gns3server/modules/vmware/__init__.py b/gns3server/modules/vmware/__init__.py
index f4b3e533..b7f5cf88 100644
--- a/gns3server/modules/vmware/__init__.py
+++ b/gns3server/modules/vmware/__init__.py
@@ -48,6 +48,7 @@ class VMware(BaseManager):
 
         super().__init__()
         self._execute_lock = asyncio.Lock()
+        self._vmware_inventory_lock = asyncio.Lock()
         self._vmrun_path = None
         self._vmnets = []
         self._vmnet_start_range = 2
@@ -191,9 +192,11 @@ class VMware(BaseManager):
                     if int(version) < 6:
                         raise VMwareError("Using VMware Player requires version 6 or above")
                 if version is None:
-                    log.warning("Could not find VMware version")
+                    log.warning("Could not find VMware version. Output of VMware: {}".format(output))
+                    raise VMwareError("Could not find VMware version. Output of VMware: {}".format(output))
             except (OSError, subprocess.SubprocessError) as e:
                 log.error("Error while looking for the VMware version: {}".format(e))
+                raise VMwareError("Error while looking for the VMware version: {}".format(e))
 
     @staticmethod
     def _get_vmnet_interfaces_registry():
@@ -355,6 +358,39 @@ class VMware(BaseManager):
 
             return stdout_data.decode("utf-8", errors="ignore").splitlines()
 
+    @asyncio.coroutine
+    def remove_from_vmware_inventory(self, vmx_path):
+        """
+        Removes a linked clone from the VMware inventory file.
+
+        :param vmx_path: path of the linked clone VMX file
+        """
+
+        with (yield from self._vmware_inventory_lock):
+            inventory_path = self.get_vmware_inventory_path()
+            if os.path.exists(inventory_path):
+                try:
+                    inventory_pairs = self.parse_vmware_file(inventory_path)
+                except OSError as e:
+                    log.warning('Could not read VMware inventory file "{}": {}'.format(inventory_path, e))
+                    return
+
+                vmlist_entry = None
+                for name, value in inventory_pairs.items():
+                    if value == vmx_path:
+                        vmlist_entry = name.split(".", 1)[0]
+                        break
+
+                if vmlist_entry is not None:
+                    for name in inventory_pairs.keys():
+                        if name.startswith(vmlist_entry):
+                            del inventory_pairs[name]
+
+                try:
+                    self.write_vmware_file(inventory_path, inventory_pairs)
+                except OSError as e:
+                    raise VMwareError('Could not write VMware inventory file "{}": {}'.format(inventory_path, e))
+
     @staticmethod
     def parse_vmware_file(path):
         """
diff --git a/gns3server/modules/vmware/vmware_vm.py b/gns3server/modules/vmware/vmware_vm.py
index 7f25821e..8460a08a 100644
--- a/gns3server/modules/vmware/vmware_vm.py
+++ b/gns3server/modules/vmware/vmware_vm.py
@@ -375,6 +375,8 @@ class VMwareVM(BaseVM):
         vnet = "ethernet{}.vnet".format(adapter_number)
         if vnet not in self._vmx_pairs:
             raise VMwareError("vnet {} not in VMX file".format(vnet))
+        if not self._ubridge_hypervisor:
+            raise VMwareError("Cannot start the packet capture: uBridge is not running")
         yield from self._ubridge_hypervisor.send('bridge start_capture {name} "{output_file}"'.format(name=vnet,
                                                                                                       output_file=output_file))
 
@@ -389,6 +391,8 @@ class VMwareVM(BaseVM):
         vnet = "ethernet{}.vnet".format(adapter_number)
         if vnet not in self._vmx_pairs:
             raise VMwareError("vnet {} not in VMX file".format(vnet))
+        if not self._ubridge_hypervisor:
+            raise VMwareError("Cannot stop the packet capture: uBridge is not running")
         yield from self._ubridge_hypervisor.send("bridge stop_capture {name}".format(name=vnet))
 
     def check_hw_virtualization(self):
@@ -560,31 +564,7 @@ class VMwareVM(BaseVM):
             pass
 
         if self._linked_clone:
-            # clean the VMware inventory path from this linked clone
-            inventory_path = self.manager.get_vmware_inventory_path()
-            inventory_pairs = {}
-            if os.path.exists(inventory_path):
-                try:
-                    inventory_pairs = self.manager.parse_vmware_file(inventory_path)
-                except OSError as e:
-                    log.warning('Could not read VMware inventory file "{}": {}'.format(inventory_path, e))
-                    return
-
-                vmlist_entry = None
-                for name, value in inventory_pairs.items():
-                    if value == self._vmx_path:
-                        vmlist_entry = name.split(".", 1)[0]
-                        break
-
-                if vmlist_entry is not None:
-                    for name in inventory_pairs.keys():
-                        if name.startswith(vmlist_entry):
-                            del inventory_pairs[name]
-
-            try:
-                self.manager.write_vmware_file(inventory_path, inventory_pairs)
-            except OSError as e:
-                raise VMwareError('Could not write VMware inventory file "{}": {}'.format(inventory_path, e))
+            yield from self.manager.remove_from_vmware_inventory(self._vmx_path)
 
         log.info("VirtualBox VM '{name}' [{id}] closed".format(name=self.name, id=self.id))
         self._closed = True
diff --git a/tests/conftest.py b/tests/conftest.py
index eff35558..59eca77b 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -147,7 +147,9 @@ def run_around_tests(monkeypatch, port_manager):
     port_manager._instance = port_manager
     config = Config.instance()
     config.clear()
-    config.set("Server", "project_directory", tmppath)
+    os.makedirs(os.path.join(tmppath, 'projects'))
+    config.set("Server", "project_directory", os.path.join(tmppath, 'projects'))
+    config.set("Server", "images_path", os.path.join(tmppath, 'images'))
     config.set("Server", "auth", False)
 
     # Prevent executions of the VM if we forgot to mock something
@@ -158,7 +160,7 @@ def run_around_tests(monkeypatch, port_manager):
     # Force turn off KVM because it's not available on CI
     config.set("Qemu", "enable_kvm", False)
 
-    monkeypatch.setattr("gns3server.modules.project.Project._get_default_project_directory", lambda *args: tmppath)
+    monkeypatch.setattr("gns3server.modules.project.Project._get_default_project_directory", lambda *args: os.path.join(tmppath, 'projects'))
 
     # Force sys.platform to the original value. Because it seem not be restore correctly at each tests
     sys.platform = sys.original_platform
diff --git a/tests/handlers/api/test_project.py b/tests/handlers/api/test_project.py
index 220339b5..5af3d03c 100644
--- a/tests/handlers/api/test_project.py
+++ b/tests/handlers/api/test_project.py
@@ -207,9 +207,9 @@ def test_notification(server, project, loop):
     @asyncio.coroutine
     def go(future):
         response = yield from aiohttp.request("GET", server.get_url("/projects/{project_id}/notifications".format(project_id=project.id), 1))
-        response.body = yield from response.content.read(19)
+        response.body = yield from response.content.read(200)
         project.emit("vm.created", {"a": "b"})
-        response.body += yield from response.content.read(47)
+        response.body += yield from response.content.read(50)
         response.close()
         future.set_result(response)
 
@@ -217,7 +217,9 @@ def test_notification(server, project, loop):
     asyncio.async(go(future))
     response = loop.run_until_complete(future)
     assert response.status == 200
-    assert response.body == b'{"action": "ping"}\n{"action": "vm.created", "event": {"a": "b"}}\n'
+    assert b'"action": "ping"' in response.body
+    assert b'"cpu_usage_percent"' in response.body
+    assert b'{"action": "vm.created", "event": {"a": "b"}}\n' in response.body
 
 
 def test_notification_invalid_id(server):
diff --git a/tests/handlers/api/test_qemu.py b/tests/handlers/api/test_qemu.py
index 619b13fd..f2f07553 100644
--- a/tests/handlers/api/test_qemu.py
+++ b/tests/handlers/api/test_qemu.py
@@ -23,7 +23,6 @@ from tests.utils import asyncio_patch
 from unittest.mock import patch
 from gns3server.config import Config
 
-
 @pytest.fixture
 def fake_qemu_bin():
 
@@ -40,7 +39,10 @@ def fake_qemu_bin():
 @pytest.fixture
 def fake_qemu_vm(tmpdir):
 
-    bin_path = os.path.join(str(tmpdir / "linux.img"))
+    img_dir = Config.instance().get_section_config("Server").get("images_path")
+    img_dir = os.path.join(img_dir, "QEMU")
+    os.makedirs(img_dir)
+    bin_path = os.path.join(img_dir, "linux载.img")
     with open(bin_path, "w+") as f:
         f.write("1")
     os.chmod(bin_path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR)
@@ -86,15 +88,17 @@ def test_qemu_create_platform(server, project, base_params, fake_qemu_bin):
 def test_qemu_create_with_params(server, project, base_params, fake_qemu_vm):
     params = base_params
     params["ram"] = 1024
-    params["hda_disk_image"] = "linux.img"
+    params["hda_disk_image"] = "linux载.img"
 
     response = server.post("/projects/{project_id}/qemu/vms".format(project_id=project.id), params, example=True)
+
     assert response.status == 201
     assert response.route == "/projects/{project_id}/qemu/vms"
     assert response.json["name"] == "PC TEST 1"
     assert response.json["project_id"] == project.id
     assert response.json["ram"] == 1024
-    assert response.json["hda_disk_image"] == "linux.img"
+    assert response.json["hda_disk_image"] == "linux载.img"
+    assert response.json["hda_disk_image_md5sum"] == "c4ca4238a0b923820dcc509a6f75849b"
 
 
 def test_qemu_get(server, project, vm):
@@ -220,10 +224,9 @@ def test_qemu_list_binaries_filter(server, vm):
 
 def test_vms(server, tmpdir, fake_qemu_vm):
 
-    with patch("gns3server.modules.Qemu.get_images_directory", return_value=str(tmpdir), example=True):
-        response = server.get("/qemu/vms")
+    response = server.get("/qemu/vms")
     assert response.status == 200
-    assert response.json == [{"filename": "linux.img", "path": "linux.img"}]
+    assert response.json == [{"filename": "linux载.img", "path": "linux载.img"}]
 
 
 def test_upload_vm(server, tmpdir):
diff --git a/tests/modules/qemu/test_qemu_manager.py b/tests/modules/qemu/test_qemu_manager.py
index 38da1cbf..7852c66e 100644
--- a/tests/modules/qemu/test_qemu_manager.py
+++ b/tests/modules/qemu/test_qemu_manager.py
@@ -177,19 +177,15 @@ def test_create_image_exist(loop, tmpdir, fake_qemu_img_binary):
                 assert not process.called
 
 
-def test_get_kvm_archs_no_kvm(loop):
-    with asyncio_patch("asyncio.create_subprocess_exec", side_effect=FileNotFoundError('kvm-ok')):
-        archs = loop.run_until_complete(asyncio.async(Qemu.get_kvm_archs()))
-        assert archs == []
-
-
 def test_get_kvm_archs_kvm_ok(loop):
 
-    process = MagicMock()
-    with asyncio_patch("asyncio.create_subprocess_exec", return_value=process):
-        process.returncode = 0
+    with patch("os.path.exists", return_value=True):
         archs = loop.run_until_complete(asyncio.async(Qemu.get_kvm_archs()))
         if platform.machine() == 'x86_64':
             assert archs == ['x86_64', 'i386']
         else:
             assert archs == platform.machine()
+
+    with patch("os.path.exists", return_value=False):
+        archs = loop.run_until_complete(asyncio.async(Qemu.get_kvm_archs()))
+        assert archs == []
diff --git a/tests/modules/qemu/test_qemu_vm.py b/tests/modules/qemu/test_qemu_vm.py
index 18288aee..1a36a62b 100644
--- a/tests/modules/qemu/test_qemu_vm.py
+++ b/tests/modules/qemu/test_qemu_vm.py
@@ -85,6 +85,22 @@ def test_vm(project, manager, fake_qemu_binary):
     assert vm.id == "00010203-0405-0607-0809-0a0b0c0d0e0f"
 
 
+def test_vm_invalid_qemu_with_platform(project, manager, fake_qemu_binary):
+
+    vm = QemuVM("test", "00010203-0405-0607-0809-0a0b0c0d0e0f", project, manager, qemu_path="/usr/fake/bin/qemu-system-64", platform="x86_64")
+
+    assert vm.qemu_path == fake_qemu_binary
+    assert vm.platform == "x86_64"
+
+
+def test_vm_invalid_qemu_without_platform(project, manager, fake_qemu_binary):
+
+    vm = QemuVM("test", "00010203-0405-0607-0809-0a0b0c0d0e0f", project, manager, qemu_path="/usr/fake/bin/qemu-system-x86_64")
+
+    assert vm.qemu_path == fake_qemu_binary
+    assert vm.platform == "x86_64"
+
+
 def test_is_running(vm, running_subprocess_mock):
 
     vm._process = None
@@ -459,6 +475,30 @@ def test_hdd_disk_image(vm, tmpdir):
     assert vm.hdd_disk_image == force_unix_path(str(tmpdir / "QEMU" / "test"))
 
 
+def test_initrd(vm, tmpdir):
+
+    vm.manager.config.set("Server", "images_path", str(tmpdir))
+
+    with patch("gns3server.modules.project.Project.emit") as mock:
+        vm.initrd = str(tmpdir / "test")
+        assert vm.initrd == force_unix_path(str(tmpdir / "test"))
+        vm.initrd = "test"
+        assert vm.initrd == force_unix_path(str(tmpdir / "QEMU" / "test"))
+        assert not mock.called
+
+
+def test_initrd_asa(vm, tmpdir):
+
+    vm.manager.config.set("Server", "images_path", str(tmpdir))
+
+    with patch("gns3server.modules.project.Project.emit") as mock:
+        vm.initrd = str(tmpdir / "asa842-initrd.gz")
+        assert vm.initrd == force_unix_path(str(tmpdir / "asa842-initrd.gz"))
+        vm.initrd = "asa842-initrd.gz"
+        assert vm.initrd == force_unix_path(str(tmpdir / "QEMU" / "asa842-initrd.gz"))
+        assert mock.called
+
+
 def test_options(linux_platform, vm):
     vm.kvm = False
     vm.options = "-usb"
diff --git a/tests/utils/test_images.py b/tests/utils/test_images.py
index 42811c84..e3f80fc0 100644
--- a/tests/utils/test_images.py
+++ b/tests/utils/test_images.py
@@ -21,13 +21,13 @@ from gns3server.utils.images import md5sum, remove_checksum
 
 
 def test_md5sum(tmpdir):
-    fake_img = str(tmpdir / 'hello')
+    fake_img = str(tmpdir / 'hello载')
 
     with open(fake_img, 'w+') as f:
         f.write('hello')
 
     assert md5sum(fake_img) == '5d41402abc4b2a76b9719d911017c592'
-    with open(str(tmpdir / 'hello.md5sum')) as f:
+    with open(str(tmpdir / 'hello载.md5sum')) as f:
         assert f.read() == '5d41402abc4b2a76b9719d911017c592'