I was not looking, and accidentally changed the management VLAN (VLAN 1) to VLAN 100. on this server, there was only one vSwitch configured. It is setup with a physical NIC (NIC 1) setup in networking. The vSwitch is connected to ESXi via NIC 1. I can't log back in to ESXi, and that was the only connection I had to ESXi. Any ideas how to restore it back to normal?
SnapOverflow
You can reconfigure the main vmk vlan setting using the console GUI. Hopefully you have either physical access to the server or some other means of accessing the console.