diff --git a/awsapi/src/com/cloud/bridge/service/core/ec2/EC2Engine.java b/awsapi/src/com/cloud/bridge/service/core/ec2/EC2Engine.java
index c64a0732f67..1363d0d7a0f 100644
--- a/awsapi/src/com/cloud/bridge/service/core/ec2/EC2Engine.java
+++ b/awsapi/src/com/cloud/bridge/service/core/ec2/EC2Engine.java
@@ -1068,9 +1068,8 @@ public class EC2Engine {
 	{
 		try {
 		    CloudStackAccount caller = getCurrentAccount();
-			if (null == request.getFormat()   || null == request.getName() || null == request.getOsTypeName() ||
-					null == request.getLocation() || null == request.getZoneName())
-				throw new EC2ServiceException(ServerError.InternalError, "Missing parameter - location/architecture/name");
+            if (null == request.getName())
+                throw new EC2ServiceException(ClientError.Unsupported, "Missing parameter - name");
 
 			List<CloudStackTemplate> templates = getApi().registerTemplate((request.getDescription() == null ? request.getName() : request.getDescription()), 
 					request.getFormat(), request.getHypervisor(), request.getName(), toOSTypeId(request.getOsTypeName()), request.getLocation(), 
diff --git a/awsapi/src/com/cloud/bridge/service/core/ec2/EC2RegisterImage.java b/awsapi/src/com/cloud/bridge/service/core/ec2/EC2RegisterImage.java
index 3fd36ba358b..d71329701ea 100644
--- a/awsapi/src/com/cloud/bridge/service/core/ec2/EC2RegisterImage.java
+++ b/awsapi/src/com/cloud/bridge/service/core/ec2/EC2RegisterImage.java
@@ -16,6 +16,9 @@
 // under the License.
 package com.cloud.bridge.service.core.ec2;
 
+import com.cloud.bridge.service.exception.EC2ServiceException;
+import com.cloud.bridge.service.exception.EC2ServiceException.ClientError;
+
 public class EC2RegisterImage {
 
 	private String  location;
@@ -67,14 +70,19 @@ public class EC2RegisterImage {
 	 */
 	public void setArchitecture( String param ) {
 		if (null != param) {
-			String parts[] = param.split( ":" );
-			if (3 <= parts.length) {
-				format = parts[0];
-				zoneName = parts[1];
-				osTypeName = parts[2];
-				hypervisor = parts[3];
-			}
-		}
+            if (!param.contains(":") || param.split(":").length < 4) {
+                throw new EC2ServiceException(  ClientError.InvalidParameterValue, "Supported format for " +
+                    "'architecture' is format:zonename:ostypename:hypervisor" );
+            }
+            String parts[] = param.split( ":" );
+            format = parts[0];
+            zoneName = parts[1];
+            osTypeName = parts[2];
+            hypervisor = parts[3];
+        }
+        else {
+            throw new EC2ServiceException(ClientError.Unsupported, "Missing Parameter -" + " architecture");
+        }
 	}
 	
 	public String getFormat() {