diff --git a/tryton/common/common.py b/tryton/common/common.py
index a8710d8fc6..5d72349a69 100644
--- a/tryton/common/common.py
+++ b/tryton/common/common.py
@@ -17,10 +17,20 @@ import traceback
 import tryton.rpc as rpc
 import locale
 import socket
+from tryton.version import VERSION
 
 _ = gettext.gettext
 
 def refresh_dblist(db_widget, host, port, dbtoload=None):
+    '''
+    Return the number of database available
+        or None if it is impossible to connect
+        or -1 if the server version doesn't macth the client version
+    '''
+    version = rpc.server_version(host, port)
+    if version:
+        if version.split('.')[:2] != VERSION.split('.')[:2]:
+            return -1
     if not dbtoload:
         dbtoload = CONFIG['login.db']
     index = 0
diff --git a/tryton/gui/main.py b/tryton/gui/main.py
index 44b8de1f3c..81fdda23ae 100644
--- a/tryton/gui/main.py
+++ b/tryton/gui/main.py
@@ -8,7 +8,6 @@ from gtk import glade
 import tryton.rpc as rpc
 from tryton.config import CONFIG, GLADE, TRYTON_ICON, PIXMAPS_DIR, DATA_DIR
 import tryton.common as common
-from tryton.version import VERSION
 from tryton.action import Action
 from tryton.gui.window import Window
 from tryton.gui.window.preference import Preference
@@ -773,12 +772,16 @@ class Main(object):
     def _choose_db_select(self, title=_("Backup a database")):
         def refreshlist(widget, db_widget, label, host, port):
             res = common.refresh_dblist(db_widget, host, port)
-            if res == -1:
-                label.set_label('<b>' + \
-                        _('Could not connect to server!') + '</b>')
+            if res is None or res == -1:
+                if res is None:
+                    label.set_label('<b>' + _('Could not connect to server!') +\
+                            '</b>')
+                else:
+                    label.set_label('<b>' + \
+                            _('Incompatible version of the server!') + '</b>')
                 db_widget.hide()
                 label.show()
-            elif res==0:
+            elif res == 0:
                 label.set_label('<b>' + \
                         _('No database found, you must create one!') + '</b>')
                 db_widget.hide()
diff --git a/tryton/gui/window/dblogin.py b/tryton/gui/window/dblogin.py
index 779f88babd..ce3c3448c5 100644
--- a/tryton/gui/window/dblogin.py
+++ b/tryton/gui/window/dblogin.py
@@ -99,13 +99,18 @@ class DBLogin(object):
     @staticmethod
     def refreshlist(widget, db_widget, label, host, port, butconnect=None):
         res = common.refresh_dblist(db_widget, host, port)
-        if res is None:
-            label.set_label('<b>'+_('Could not connect to server!')+'</b>')
+        if res is None or res == -1:
+            if res is None:
+                label.set_label('<b>' + _('Could not connect to server!') + \
+                        '</b>')
+            else:
+                label.set_label('<b>' + \
+                        _('Incompatible version of the server!') + '</b>')
             db_widget.hide()
             label.show()
             if butconnect:
                 butconnect.set_sensitive(False)
-        elif res==0:
+        elif res == 0:
             label.set_label('<b>' + \
                     _('No database found, you must create one!') + '</b>')
             db_widget.hide()
diff --git a/tryton/rpc.py b/tryton/rpc.py
index 9a2b0f198f..eb90bcde14 100644
--- a/tryton/rpc.py
+++ b/tryton/rpc.py
@@ -62,6 +62,33 @@ def db_exec(host, port, method, *args):
     except:
         raise
 
+def server_version(host, port):
+    global _SOCK, SECURE
+    _SEMAPHORE.acquire()
+    try:
+        try:
+            if _SOCK and (_SOCK.hostname != host or _SOCK.port != port):
+                _SOCK.disconnect()
+            if _SOCK is None:
+                _SOCK = pysocket.PySocket()
+            if not _SOCK.connected:
+                _SOCK.connect(host, port)
+            try:
+                _SOCK.send(('common', 'version'))
+            except Exception, exception:
+                if exception[0] == 32:
+                    _SOCK.reconnect()
+                    _SOCK.send(('db', 'list'))
+                else:
+                    raise
+            res = _SOCK.receive()
+            SECURE = _SOCK.ssl
+        finally:
+            _SEMAPHORE.release()
+        return res
+    except:
+        return None
+
 def login(username, password, host, port, database):
     global _SOCK, _USER, _USERNAME, _SESSION, _DATABASE, _VIEW_CACHE, SECURE
     _VIEW_CACHE = {}