I’ve just recently run in to a problem trying to access ESXi’s CLI from the console using IMM2 (Integrated Management Module). The KVM seems to be intercepting commands incorrectly. This seems to be the case for a number of KVM tools.
The normal command for accessing the CLI once enabled, is to press ALT+F1. This won’t work. You will need to hold down ALT+Space, release Space and press F1 while keeping ALT held down.
ALT+Space release space ALT+F1