My ASA 5520 has been working well for the past 6 months. Most of the clients connections are IPSec/NAT-T. Today one of my clients connected for the first time and they just connected IPSec. The IPSec client could not pass traffic across the VPN.
Thus I am trying to find answers to two questions:
1) What causes a client to connect IPSec instead of IPSec/NAT-T.
2) Why can't the IPSec client pass traffic?
Perhaps there is some documention available that explains this issue, however I have been unable to locate it.
Any assistance is appreciated.