you may want to do a search on main forum or google on error 56 to find a solid fix for issue, I have seen this report like yours mostly in systems runing vista OS so it seems the common denominator may not be cisco vpn client but vista itself, I would suggest to goodle this error and see what other have done to get by.
I have multiple issues with Cisco client and Vista os , i have contacted cisco TAC and Microsoft. Then saw the blame game among the industry leaders and had no help. since then i have been using the free ware vpn client ( compatible with cisco and understands pcf files as well ) . try using shrewsoft vpn client from shrew.net. It also works perfectly with vista/ win7 64 bit edition.
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:
Check the current version availa...
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...