I installed a vpnc on my Linux red-hat machine version 6.3
Most of the cases vpnc work well ( connecting to gateway customers by vpnc )
But against some particular customers ( Cisco gateways ) , immediately after I activate the vpnc I get the following messages:
vpnc: quick mode response rejected: (ISAKMP_N_INVALID_PAYLOAD_TYPE)(1)
In this case Vpnc could not be connected
Please advice what the problem here? ,
[root@TEST-LINUX-MACHINE /var/tmp]# vpnc
Enter password for user@216.134.162.39:
Connect Banner:
| Remote access to UGG company resources is restricted to AUTHORIZED USERS!
|
| Company resources may only be used for the purpose of performing work-related duties.
| The user is responsible for protecting the confidentiality and integrity of the company resources.
| Violation may cause disciplinary action.
| By clicking on "Continue" the user agrees with the rules above.
|
RTNETLINK answers: File exists
**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
I also try to do the follwoing
Add the line "NAT Traversal Mode cisco-udp" in /etc/vpnc.conf
Or
Add the line "Local Port 10000" in /etc/vpnc.conf
But they dosent help and I still get the bad messages ( chuld not be connected by the vpnc )
Please advice where is the problem ?
