IPSec VPN help

[Genmaken]

Hi,

I'm using PFsense 2.0.1. and trying to establish a VPN between two sites.

Site A - 192.168.0.0/23 -> NAT to 172.18.0.5
Site B - 10.0.0.0/8

Phase 1 config:
Identifiers -WAN addresses
Policy Generation / Proposal Checking - Default
AES 256 + SHA1
DH group 2
Lifetime: 86400

Phase 1 apparently completes successfully but after 1 second ISAMP-SA expires and is deleted.
VPN log:

• Mar 13 15:05:40 racoon: [VPN]: INFO: ISAKMP-SA established Site A WAN [500]-Site B WAN[500] spi:406759183d754d24:6cf16552504d465e

• Mar 13 15:05:41 racoon: [VPN]: INFO: initiate new phase 2 negotiation: Site A WAN [500]-Site B WAN[500]

• Mar 13 15:05:41 racoon: [VPN]: INFO: ISAKMP-SA expired Site A WAN [500]-Site B WAN[500] spi:406759183d754d24:6cf16552504d465e

• Mar 13 15:05:41 racoon: [VPN]: INFO: ISAKMP-SA deleted Site A WAN [500]-Site B WAN[500] spi:406759183d754d24:6cf16552504d465e

Let me know if it's useful to paste the debug log here. Among all the entries I can see this message:

racoon: ERROR: "SITE B WAN" give up to get IPsec-SA due to time up to wait.

Any idea why the phase 1 expires almost instantly? Could this be a config mismatch issue?

Thanks