Hi,
please check the driver and firmware versions in the vSphere Client. Look a the "Hardware Status" tab, expand "Software Components", and look there for "be2net device firmware" and "be2net driver" versions.
To install the current drivers you need to download them from VMware (links are in the KB article). Extract the offline_bundle files from the downloads and import them into VUM. You can then install them through VUM.
- Andreas