diff --git a/gns3server/modules/dynamips/hypervisor.py b/gns3server/modules/dynamips/hypervisor.py
index a568ff51..caac0148 100644
--- a/gns3server/modules/dynamips/hypervisor.py
+++ b/gns3server/modules/dynamips/hypervisor.py
@@ -140,7 +140,12 @@ class Hypervisor(DynamipsHypervisor):
             except asyncio.TimeoutError:
                 if self._process.returncode is None:
                     log.warn("Dynamips process {} is still running... killing it".format(self._process.pid))
-                    self._process.kill()
+                    try:
+                        self._process.kill()
+                    except OSError as e:
+                        log.error("Cannot stop the Dynamips process: {}".format(e))
+                    if self._process.returncode is None:
+                        log.warn('Dynamips hypervisor with PID={} is still running'.format(self._process.pid))
 
         if self._stdout_file and os.access(self._stdout_file, os.W_OK):
             try:
diff --git a/gns3server/modules/qemu/qemu_vm.py b/gns3server/modules/qemu/qemu_vm.py
index 795a3969..94d0d334 100644
--- a/gns3server/modules/qemu/qemu_vm.py
+++ b/gns3server/modules/qemu/qemu_vm.py
@@ -604,9 +604,12 @@ class QemuVM(BaseVM):
                 self._process.terminate()
                 self._process.wait()
             except subprocess.TimeoutExpired:
-                self._process.kill()
+                try:
+                    self._process.kill()
+                except OSError as e:
+                    log.error("Cannot stop the Qemu process: {}".format(e))
                 if self._process.returncode is None:
-                    log.warn('QEMU VM "{}" PID={} is still running'.format(self._name, self._process.pid))
+                    log.warn('QEMU VM "{}" with PID={} is still running'.format(self._name, self._process.pid))
         self._process = None
         self._started = False
         self._stop_cpulimit()
diff --git a/gns3server/modules/vpcs/vpcs_vm.py b/gns3server/modules/vpcs/vpcs_vm.py
index 78cc644d..f9b42bf7 100644
--- a/gns3server/modules/vpcs/vpcs_vm.py
+++ b/gns3server/modules/vpcs/vpcs_vm.py
@@ -253,11 +253,12 @@ class VPCSVM(BaseVM):
                     yield from gns3server.utils.asyncio.wait_for_process_termination(self._process, timeout=3)
                 except asyncio.TimeoutError:
                     if self._process.returncode is None:
-                        log.warn("VPCS process {} is still running... killing it".format(self._process.pid))
                         try:
                             self._process.kill()
                         except OSError as e:
-                            raise VPCSError("Can not stop the VPCS process: {}".format(e))
+                            log.error("Cannot stop the VPCS process: {}".format(e))
+                        if self._process.returncode is None:
+                            log.warn('VPCS VM "{}" with PID={} is still running'.format(self._name, self._process.pid))
 
         self._process = None
         self._started = False