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Zywall USG 300 ipsec config issue

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http://serverfault.com – We have a Zywall USG 300 which dials ipsec to a Server 2008 R2 server. This was working until recently when any attempt to communicate with the server sees the following in the logs. error IPSec SPI:0x0 SEQ:0x0 No rule found, Dropping packet [count=2] internal-ip external-ip ipsec There hasn't been a change on the network... (at least that we're aware of) to explain it stopping working We have Zywal routes set up Anything incoming on the VPN routes to our LAN Anything from our LAN destined for the external network routes through the VPN We have firewall rules set from the external (HowTos)