Hi

i'm having trouble connecting 2 x Draytek 3900 together. They both have other IPSec VPN's connected and working, however when i try to connect them to each other the Syslog is spammed with the below -

<141>Nov 20 11:08:38 Vigor: pluto[19121]: packet from IP ADDRESS:500: phase 1 message is part of an unknown exchange.
<141>Nov 20 11:08:47 Vigor: pluto[19121]: "IP SEC VPN" #9630: sending notification NO_PROPOSAL_CHOSEN to IP ADDDRESS:500
<141>Nov 20 11:08:51 Vigor: pluto[19121]: "IP SEC VPN" #9631: no acceptable Oakley Transform
<141>Nov 20 11:08:51 Vigor: pluto[19121]: "IP SEC VPN" #9631: Can't authenticate: no preshared key found for `IP ADDRESS' and `IP ADDRESS'. Attribute OAKLEY_AUTHENTICATION_METHOD

I've tried changing the proposal on sides but it's the same error every time.

Any help will be grateful.