Index: /trunk/src/VBox/Main/src-server/NATEngineImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/src-server/NATEngineImpl.cpp	(revision 35534)
+++ /trunk/src/VBox/Main/src-server/NATEngineImpl.cpp	(revision 35535)
@@ -289,9 +289,9 @@
         if (it->first == name)
             return setError(E_INVALIDARG,
-                            tr("A NAT rule of this name does already exist"));
+                            tr("A NAT rule of this name already exists"));
         if (   r.strHostIP == Utf8Str(aBindIp)
             && r.u16HostPort == aHostPort)
             return setError(E_INVALIDARG,
-                            tr("A NAT rule for this host port and this host IP does already exist"));
+                            tr("A NAT rule for this host port and this host IP already exists"));
     }