Hi Michael,   I read this from Dell support forum and they said "This is a problem on any NX OS after nxos.7.0.3.I2.2a.bin, I've tried so many versions and it seems it will never work again.  Theory is they were allowing something they shouldn't have...

Hi Michael,    We have exact same problem with almost same hardware. We have sc4020 with nexus 3172PQ and when I connect SAN to nexus disk latency goes over 300ms and throughput of 10M.  when we rdp to vm it always show the warning windows to confirm...