diff --git a/api/src/com/cloud/api/commands/UpdateNetworkOfferingCmd.java b/api/src/com/cloud/api/commands/UpdateNetworkOfferingCmd.java
index 8188bc096ac..873b71c115e 100644
--- a/api/src/com/cloud/api/commands/UpdateNetworkOfferingCmd.java
+++ b/api/src/com/cloud/api/commands/UpdateNetworkOfferingCmd.java
@@ -34,7 +34,6 @@ import com.cloud.api.Parameter;
 import com.cloud.api.ServerApiException;
 import com.cloud.api.response.NetworkOfferingResponse;
 import com.cloud.offering.NetworkOffering;
-import com.cloud.offering.NetworkOffering.Availability;
 import com.cloud.user.Account;
 
 @Implementation(description="Updates a network offering.", responseObject=NetworkOfferingResponse.class)
diff --git a/server/src/com/cloud/network/NetworkManagerImpl.java b/server/src/com/cloud/network/NetworkManagerImpl.java
index f48e8a50a87..b560bab75c8 100755
--- a/server/src/com/cloud/network/NetworkManagerImpl.java
+++ b/server/src/com/cloud/network/NetworkManagerImpl.java
@@ -3282,6 +3282,11 @@ public class NetworkManagerImpl implements NetworkManager, NetworkService, Manag
             }
             
             if (networkOfferingId != oldNetworkOfferingId) {
+            	 //don't allow to update shared network
+                if (offering.getGuestType() != GuestType.Isolated) {
+                	throw new InvalidParameterValueException("NetworkOfferingId can be upgraded only for the network of type " + GuestType.Isolated);
+                }
+            	
                 //check if the network is upgradable
                 if (!canUpgrade(oldNetworkOfferingId, networkOfferingId)) {
                     throw new InvalidParameterValueException("Can't upgrade from network offering " + oldNetworkOfferingId + " to " + networkOfferingId + "; check logs for more information");
@@ -3299,6 +3304,11 @@ public class NetworkManagerImpl implements NetworkManager, NetworkService, Manag
                                 + "and the hyphen ('-'); can't start or end with \"-\"");
             }
             
+            //don't allow to update shared network
+            if (offering.getGuestType() == GuestType.Shared) {
+            	throw new InvalidParameterValueException("Can't upgrade the networkDomain for the network of type " + GuestType.Isolated);
+            }
+            
             long offeringId = oldNetworkOfferingId;
             if (networkOfferingId != null) {
                 offeringId = networkOfferingId;
@@ -3532,6 +3542,8 @@ public class NetworkManagerImpl implements NetworkManager, NetworkService, Manag
         NetworkOffering oldNetworkOffering = _networkOfferingDao.findByIdIncludingRemoved(oldNetworkOfferingId);
         NetworkOffering newNetworkOffering = _networkOfferingDao.findById(newNetworkOfferingId);
         
+        //can upgrade only Isolated networks
+        
         //security group service should be the same
         if (areServicesSupportedByNetworkOffering(oldNetworkOfferingId, Service.SecurityGroup) != areServicesSupportedByNetworkOffering(newNetworkOfferingId, Service.SecurityGroup)) {
             s_logger.debug("Offerings " + newNetworkOfferingId + " and " + oldNetworkOfferingId + " have different securityGroupProperty, can't upgrade");