关于gadmin-proftpd的设置

我在ubuntu9.10上安装vpnc后进行如下配置，但阶段一协商成功，XAUTH认证也通过，之后的就不通了
请问是什么原因呢?和提议集有关吗?还是vpnc不支持其他厂商的防火墙呢?
头一次发帖，拜托大家了，有知道的帮帮忙啦!

1)使用配置命令进行配置:
root@thunderbolt:/etc/vpnc# vpnc
Enter IPSec gateway address: 192.168.0.1
Enter IPSec ID for 192.168.0.1: vpnc
Enter IPSec secret for [email protected]:
Enter username for 192.168.0.1: xauth
Enter password for [email protected]:
root@thunderbolt:/etc/vpnc#
遇到的问题
1)运行脚本后在客户端打印如下信息:
vpnc: configuration response rejected: (ISAKMP_N_INVALID_MESSAGE_ID)(9)
2)运行脚本后在防火墙打印如下信息:
[IKEv1]: "xauth"[2] 192.168.0.199 #70: XAUTH authentication COMPLETED
[IKEv1]: "xauth"[2] 192.168.0.199 #70: Internal IP: 20.1.1.2
[IKEv1]: "xauth"[2] 192.168.0.199 #70: sending ModeCfg set
[IKEv1]: packet from 192.168.0.199:500: Informational Exchange is for an unknown (expired?) SA
[IKEv1]: packet from 192.168.0.199:500: Informational Exchange is for an unknown (expired?) SA