This is just a quick note to describe how you can easily change the vlan ID of the service console in ESX.
To remove the vlan id completely, just set it to 0 (in case you have set it by accident on an access port)
esxcfg-vswitch vSwitch0 -v 0 -p “Service Console”
To set a vlan id on the service console (in case you forgot to define this during the installation)
esxcfg-vswitch vSwitch0 -v X -p “Service Console” (enter the vlan number where X is)
Of course make sure to check which vSwitch the Service Console is on (and the name of the Service Console) with esxcfg-vswitch -l