I've mainly still been using the desktop client to manage vCenter since it's easier to keep it open on the desktop. For a while now, I've been seeing weird network issues, and I think i just found out why.
For some reason, vmnic1 is showing up on the web as an unused adapter. It isn't even assigned to that vSwitch, and in fact isn't assigned to any vSwitch yet. I have a few other vmnics that aren't configured yet either. This server has been formatted and setup from scratch, so I'm wondering if maybe there's some stale info still in the vCenter database. In the desktop client, it doesn't show vmnic1 as being unused, it's only in the web client that it shows up.