I would have to review the notes from support to find out why. IF they say it is the Intel NIC issue then maybe try to set the parameters for Auto Negotiation.
On console ALT+CTRL+T->Modify driver options select e1000 option and choose AutoNeg. Set this value to 32. More info about driver options in link below.

Anyway you can download the Demo-CD for DSS and run a test (not using the USB) then send back the results using the sames ticket number also with MPIO (with Microsoft), I think this is what they meant. This way we can verify it is not just the iSCSI-R3 issue.

Also was this an upgrade from older version of 2.21 to 2.30, if so try deleting the Unit (VG) and recreate it again. I dont know the case history in which you had with support but what is the type of RAID controller that you are using?

Keep in mind that there are sometimes isolated incedents where the hw could be the issue and maybe there is a seeting that we need to tweak. Email back to support your findings for OpenFiler as well.

http://www.intel.com/support/network/sb/cs-009209.htm