I am somewhat puzzled. When you look for show cry isa sa you are looking for ISAKMP but this is used for IPSec. I would expect the clientless and the AnyConnect sessions to be SSL based and not IPSec ISAKMP based.
I would also ask whether you already have installed the AnyConnect Essentials license on this ASA.
Thanks a bunch for the help, @Richard: Anyconnect license is already installed because it was previously working. I noticed that configuration change today after the reboot. I didn´t know if the SA and Clientless where related, but I know understand that they are 2 separte things completely.
*- Just to clarify, if I run the vpn-sessiondb logoff it will knock out all the clientless sessions.
So step 1: Run vpn-sessiondb logoff
Step 2:Run in (config-webvpn)anyconnect-essentials
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...