diff --git a/src/image/ImagePool.cc b/src/image/ImagePool.cc
index bdb8abd2dc..5f364c8a7d 100644
--- a/src/image/ImagePool.cc
+++ b/src/image/ImagePool.cc
@@ -82,10 +82,12 @@ int ImagePool::allocate (
     {
         ostringstream oss;
 
-        oss << "NAME is already taken by image " << img_aux->get_oid() << ".";
+        oss << "NAME is already taken by IMAGE " << img_aux->get_oid() << ".";
         error_str = oss.str();
 
         *oid = -1;
+
+        delete img;
     }
     else
     {
diff --git a/src/vnm/VirtualNetwork.cc b/src/vnm/VirtualNetwork.cc
index 68e4568b96..7dd18572c8 100644
--- a/src/vnm/VirtualNetwork.cc
+++ b/src/vnm/VirtualNetwork.cc
@@ -74,7 +74,7 @@ const char * VirtualNetwork::db_names     = "oid, name, body, uid";
 
 const char * VirtualNetwork::db_bootstrap = "CREATE TABLE IF NOT EXISTS"
     " network_pool (oid INTEGER PRIMARY KEY, name VARCHAR(256),"
-    " body TEXT, uid INTEGER, UNIQUE(name))";
+    " body TEXT, uid INTEGER, UNIQUE(name,uid))";
 
 /* -------------------------------------------------------------------------- */
 /* -------------------------------------------------------------------------- */
diff --git a/src/vnm/VirtualNetworkPool.cc b/src/vnm/VirtualNetworkPool.cc
index d0ddab04b3..854ec9f658 100644
--- a/src/vnm/VirtualNetworkPool.cc
+++ b/src/vnm/VirtualNetworkPool.cc
@@ -77,10 +77,30 @@ int VirtualNetworkPool::allocate (
     string&        error_str)
 {
     VirtualNetwork *    vn;
+    VirtualNetwork *    vn_aux;
+    string              name;
 
     vn = new VirtualNetwork(uid, user_name, vn_template);
 
-    *oid = PoolSQL::allocate(vn, error_str);
+    // Check for duplicates
+    vn->get_template_attribute("NAME", name);
+    vn_aux = get(name,uid,false);
+
+    if( vn_aux != 0 )
+    {
+        ostringstream oss;
+
+        oss << "NAME is already taken by NET " << vn_aux->get_oid() << ".";
+        error_str = oss.str();
+
+        *oid = -1;
+
+        delete vn;
+    }
+    else
+    {
+        *oid = PoolSQL::allocate(vn, error_str);
+    }
 
     return *oid;
 }
diff --git a/src/vnm/test/VirtualNetworkPoolTest.cc b/src/vnm/test/VirtualNetworkPoolTest.cc
index f538064ec2..d3d6900b41 100644
--- a/src/vnm/test/VirtualNetworkPoolTest.cc
+++ b/src/vnm/test/VirtualNetworkPoolTest.cc
@@ -399,7 +399,7 @@ public:
 
     void duplicates()
     {
-        int rc, oid_0, oid_1;
+        int rc, oid_0, oid_1, oid_2, oid_3;
         VirtualNetworkPoolFriend * vnpool =
                                 static_cast<VirtualNetworkPoolFriend *>(pool);
         VirtualNetwork     * vnet;
@@ -414,15 +414,15 @@ public:
         CPPUNIT_ASSERT( rc ==  oid_1 );
         CPPUNIT_ASSERT( rc == -1 );
 
-        // With different user ID
-        rc = vnpool->allocate(uids[1], user_names[1], templates[0], &oid_1);
-        CPPUNIT_ASSERT( rc ==  oid_1 );
-        CPPUNIT_ASSERT( rc == -1 );
+        // Same VNet, with different user ID
+        rc = vnpool->allocate(uids[1], user_names[1], templates[0], &oid_2);
+        CPPUNIT_ASSERT( rc ==  oid_2 );
+        CPPUNIT_ASSERT( rc == 1 );
 
         // Insert a different template, with the same user ID
-        rc = vnpool->allocate(uids[1], user_names[1], templates[1], &oid_1);
-        CPPUNIT_ASSERT( rc == oid_1 );
-        CPPUNIT_ASSERT( rc == 1 );
+        rc = vnpool->allocate(uids[1], user_names[1], templates[1], &oid_3);
+        CPPUNIT_ASSERT( rc == oid_3 );
+        CPPUNIT_ASSERT( rc == 2 );
 
 
         // Make sure the table contains only one vnet with name[0]
@@ -434,8 +434,9 @@ public:
 
         ret = pool->search(results, table, where);
         CPPUNIT_ASSERT(ret             == 0);
-        CPPUNIT_ASSERT(results.size()  == 1);
+        CPPUNIT_ASSERT(results.size()  == 2);
         CPPUNIT_ASSERT(results.at(0)   == oid_0);
+        CPPUNIT_ASSERT(results.at(1)   == oid_2);
 
         // Get the vnet and check it, to make sure the user id was not rewritten
         vnet = vnpool->get(oid_0, false);