VMWare ESXİ 5.X
Cisco Virtual E-mail Security Appliance 9.x (ESA aka Ironport)
During initial installation of Virtual ESA on VMWare you use CLI console using vSphere Client. But sometimes (I suspected that If you change Network Card connections of the Virtual Appliance) console hangs.
Press alt+f2. This will open a new session (ttyv1). You can continue to configure ESA.
You can return to ttyv0 by pressing alt+f1
you need to reboot appliance to get ttyv0 works again.