Without details about your setup it's hard to say what's wrong. Please provide as many details as possible about your test environment, the versions you use and the network configuration (especially the iSCSI setup).
Best bet is usually to use the vendor's best practice documentation. On the Starwind website you will find these under Resources, on the Kernsafe website it's not easy to find the documentation and what I found is a little bit outdated (configurations for ESX 4.0), but maybe I missed something. However, since you are working for Kernsafe I'm sure you have access to documentation.
André