ipsec Informational Exchange message must be encrypted

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http://serverfault.com – I am trying to get a VPN working between Ubuntu and a SonicWall router. I got it configured, but I am getting an odd error whenever a packet comes in to the Ubuntu box "Informational Exchange message must be encrypted" Any ideas? ipsec.conf: conn metal type=tunnel left= leftsubnet= leftid=@linux right=x.x.x.x (my sonicwall WAN IP) rightsubnet= x.x.x.x/19 (my sonicwall LAN network) rightid=@sonic auto=add auth=esp pfs=no authby=secret keyingtries=0 esp=3DES-SHA1 keyexchange=ike ike=3des-sha1-modp1024 aggrmode=yes ipsec.secret @linux @sonic: PSK "sonic" Sonicw (HowTos)