So I've had vpnc up and working to connect to my company's VPN concentrator, then all of the sudden i stopped working..Apparently they must have made a change on the Cisco concentrator...Does anyone know if there is a workaround for this problem, or if there's another Cisco compatible client available for linux?
vpnc: quick mode response rejected: (ISAKMP_N_INVALID_PAYLOAD_TYPE)(1)
this means the concentrator did not like what we had to offer.
Possible reasons are:
* concentrator configured to require a firewall
this locks out even Cisco clients on any platform expect windows
which is an obvious security improvment. There is no workaround (yet).
* concentrator configured to require IP compression
this is not yet supported by vpnc.
Note: the Cisco Concentrator Documentation recommends against using
compression, expect on low-bandwith (read: ISDN) links, because it
uses much CPU-resources on the concentrator