DSS V6 and vmware ESX 3.0.3u1

Hi

I'm trying to use the open-e DSS V6(trial) with our vmware ESX 3.0.3u1 environment.
Because we want to upgrade our ESX to 3.5 and our current san is not supported anymore we would want to switch to open-e.
but until now I'm unable to access the ISCSI storage with my vmware hosts.
However when I run a vm on top of the esx I can connect through the Windows ISCSI initiator.

I already tried to change the protocol from SCST to IETD, but no success.

Any ideas how to get this configuration working?
If you need more information, please ask and I will provide it.