I am having a similar problem with the same setup IOS router and anyconnect client.
I can get mine to work for a while. I can access some items but after time goes by I can only send packets from the client and I never receive anything back.
I thought maybe it is because fragmentation. I enabled ip tcp mss-adjust 1300 on the VPN interface and it did help. I think it is still fragmenting UDP packets. At this point I can open Outlook 2003 and RDP sessions to Windows Servers but as soon as I try copying a file using SMB from a Windows Server it stops sending and I lose connection to the VPN. The anyconnect client shows still connected and it sends but it doesn't receive. I think it is because I am experiencing UDP fragmentation
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
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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...