Getting Cisco VPN software to work on a Windows guest running in VirtualBox
Problem: Cisco VPN client running on a Windows XP guest in VirtualBox is unable to connect. Each attempt to connect is met with the same result — it won’t connect and endlessly asks for re-authentication.
Answer: After some googling, I made a snapshot of the guest (just in case), and changed the guest configuration from using the default NAT setup to having it bridge directly to my network. Bring the guest back up and attempt the VPN connection again and lo’ and behold, it works. The why/hows are still unknown, but at least it works.