[Openswan Users] ignoring Vendor ID payload

[Norbert Wegener]

Sometimes I get this messages on the server side. In this case no 
further communication is possible for the client.
This happens as well with the latest strongswan as with the latest 
openswan. The client here is a Windows XP.
A connection to a *swan gateway that is configured identically works for 
the client.
Any ideas, what might cause this?
Oct  6 16:21:39 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
ignoring Vendor ID payload [MS NT5 ISAKMPOAKLEY 00000004]
Oct  6 16:21:39 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
ignoring Vendor ID payload [FRAGMENTATION]
Oct  6 16:21:39 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02_n]
Oct  6 16:21:39 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
ignoring Vendor ID payload [Vid-Initial-Contact]
Oct  6 16:21:39 lnxhan pluto[30400]: "ad-l2tp-linuxnat"[1] 203.92.85.138 
#1: responding to Main Mode from unknown peer 203.92.85.138
Oct  6 16:21:43 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
ignoring Vendor ID payload [MS NT5 ISAKMPOAKLEY 00000004]
Oct  6 16:21:43 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
ignoring Vendor ID payload [FRAGMENTATION]
Oct  6 16:21:43 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02_n]
Oct  6 16:21:43 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
ignoring Vendor ID payload [Vid-Initial-Contact]
Oct  6 16:21:43 lnxhan pluto[30400]: "ad-l2tp-linuxnat"[1] 203.92.85.138 
#2: responding to Main Mode from unknown peer 203.92.85.138
Oct  6 16:21:51 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
ignoring Vendor ID payload [MS NT5 ISAKMPOAKLEY 00000004]
Oct  6 16:21:51 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
ignoring Vendor ID payload [FRAGMENTATION]
Oct  6 16:21:51 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
received Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02_n]
Oct  6 16:21:51 lnxhan pluto[30400]: packet from 203.92.85.138:500: 
ignoring Vendor ID payload [Vid-Initial-Contact]

ipsec auto --status shows at the end:

000 #8: "ad-l2tp-linuxnat"[2] 203.92.85.138 STATE_MAIN_R1 (sent MR1, 
expecting MI2); EVENT_RETRANSMIT in 15s
000 #5: "ad-l2tp-linuxnat"[2] 203.92.85.138 STATE_MAIN_R1 (sent MR1, 
expecting MI2); EVENT_RETRANSMIT in 8s
000 #9: "ad-l2tp-linuxnat"[2] 203.92.85.138 STATE_MAIN_R1 (sent MR1, 
expecting MI2); EVENT_RETRANSMIT in 3s
000 #7: "ad-l2tp-linuxnat"[2] 203.92.85.138 STATE_MAIN_R1 (sent MR1, 
expecting MI2); EVENT_RETRANSMIT in 11s
000 #6: "ad-l2tp-linuxnat"[2] 203.92.85.138 STATE_MAIN_R1 (sent MR1, 
expecting MI2); EVENT_RETRANSMIT in 9s
000

Norbert