diff --git a/src/onegate/onegate-server.rb b/src/onegate/onegate-server.rb
index 95c889f40c3..4d529ffb360 100644
--- a/src/onegate/onegate-server.rb
+++ b/src/onegate/onegate-server.rb
@@ -1019,6 +1019,7 @@ def build_vnet_hash(vnet, client, extended)
 
     check_vm_in_service(source_vm['ID'], service_id, client)
 
+    request.body.rewind
     cardinality = JSON.parse(request.body.read)["cardinality"]
     body_json = {
           :cardinality => cardinality,