diff --git a/gns3server/modules/dynamips/__init__.py b/gns3server/modules/dynamips/__init__.py
index 8a834771..d87ecaa6 100644
--- a/gns3server/modules/dynamips/__init__.py
+++ b/gns3server/modules/dynamips/__init__.py
@@ -274,7 +274,7 @@ class Dynamips(IModule):
                                                                                                   e))
                             return
 
-                self._hypervisor_manager.working_dir = os.path.join(new_working_dir, "dynamips")
+                self._hypervisor_manager.working_dir = new_working_dir
                 self._working_dir = new_working_dir
 
             # apply settings to the hypervisor manager
diff --git a/gns3server/modules/dynamips/hypervisor_manager.py b/gns3server/modules/dynamips/hypervisor_manager.py
index d016afb4..5518fa16 100644
--- a/gns3server/modules/dynamips/hypervisor_manager.py
+++ b/gns3server/modules/dynamips/hypervisor_manager.py
@@ -22,6 +22,8 @@ Manages Dynamips hypervisors (load-balancing etc.)
 from .hypervisor import Hypervisor
 from .dynamips_error import DynamipsError
 from pkg_resources import parse_version
+
+import os
 import socket
 import time
 import logging
@@ -126,12 +128,12 @@ class HypervisorManager(object):
         :param working_dir: path to Dynamips working directory
         """
 
-        self._working_dir = working_dir
+        self._working_dir = os.path.join(working_dir, "dynamips")
         log.info("working directory set to {}".format(self._working_dir))
 
         # update all existing hypervisors with the new working directory
         for hypervisor in self._hypervisors:
-            hypervisor.working_dir = working_dir
+            hypervisor.working_dir = self._working_dir
 
     @property
     def base_hypervisor_port(self):
@@ -529,7 +531,7 @@ class HypervisorManager(object):
             log.warn("hypervisor {}:{} has a memory load below 0 ({})".format(hypervisor.host,
                                                                               hypervisor.port,
                                                                               hypervisor.memory_load))
-            hypervisor.memory_load = 0
+            #hypervisor.memory_load = 0
 
         # memory load at 0MB and no devices managed anymore...
         # let's stop this hypervisor
diff --git a/gns3server/modules/dynamips/nodes/router.py b/gns3server/modules/dynamips/nodes/router.py
index ab485b36..45f0feea 100644
--- a/gns3server/modules/dynamips/nodes/router.py
+++ b/gns3server/modules/dynamips/nodes/router.py
@@ -274,12 +274,14 @@ class Router(object):
             if self.console and self.aux:
                 # check that console and aux ports are available
                 try:
-                    DynamipsHypervisor.find_unused_port(self.console, self.console + 1, self._hypervisor.host)
+                    #FIXME: use a defined range
+                    DynamipsHypervisor.find_unused_port(self.console, self.console + 100, self._hypervisor.host)
                 except DynamipsError:
                     raise DynamipsError("console port {} is not available".format(self.console))
 
                 try:
-                    DynamipsHypervisor.find_unused_port(self.aux, self.aux + 1, self._hypervisor.host)
+                    #FIXME: use a defined range
+                    DynamipsHypervisor.find_unused_port(self.aux, self.aux + 100, self._hypervisor.host)
                 except DynamipsError:
                     raise DynamipsError("aux port {} is not available".format(self.aux))
 
@@ -539,9 +541,9 @@ class Router(object):
                                                                                                old_ram=self._ram,
                                                                                                new_ram=ram))
 
-        self._hypervisor.decrease_memory_load(ram)
+        self._hypervisor.decrease_memory_load(self._ram)
         self._ram = ram
-        self._hypervisor.increase_memory_load(self._ram)
+        self._hypervisor.increase_memory_load(ram)
 
     @property
     def nvram(self):
diff --git a/gns3server/modules/iou/__init__.py b/gns3server/modules/iou/__init__.py
index 30a0e521..b01e156b 100644
--- a/gns3server/modules/iou/__init__.py
+++ b/gns3server/modules/iou/__init__.py
@@ -201,7 +201,7 @@ class IOU(IModule):
             log.info("iouyap path set to {}".format(self._iouyap))
 
         if "working_dir" in request:
-            new_working_dir = os.path.join(request["working_dir"], "iou")
+            new_working_dir = request["working_dir"]
             log.info("this server is local with working directory path to {}".format(new_working_dir))
         else:
             new_working_dir = os.path.join(self._projects_dir, request["project_name"])
diff --git a/setup.py b/setup.py
index 45772e4e..18e3c432 100644
--- a/setup.py
+++ b/setup.py
@@ -46,7 +46,7 @@ setup(
     long_description=open("README.rst", "r").read(),
     install_requires=[
         "tornado >= 3.1",
-        "pyzmq == 14.0.1",
+        "pyzmq",
         ],
     entry_points={
         "console_scripts": [