Cisco ASA Site-To-Site VPN “Can’t find a valid tunnel group, aborting…!”

I was recently setting up an IPSec VPN tunnel between a Sophos UTM and Cisco ASA. When doing so I kept getting the the following error when looking in the ASDM debug logs:“Can’t find a valid tunnel group, aborting…!” Followed by:“Header invalid, missing SA payload!” It turns out when you are creating the VPN, ASAsRead More