WatchGuard Site-to-Site VPN

I am trying to set up a site-to-site VPN from a WatchGuard Firebox X750e (Fireware v8.3) and a WatchGuard SOHO 6 (v6.4.1). I believe the tunnel is setup correctly but I cannot get traffic to pass between the sites. I think the issue is with the firewall policy on the SOHO side. I have a setting allowing IPSEC into the firewall but I am getting the following errors in the logs of the SOHO when I try to ping from the Firebox side to the SOHO side:

2007-04-24-03:34:59 MONITOR allowed from 192.168.0.100 port 59830 to 71.41.219.94 port 17983 UDP(allow by Outgoing)
2007-04-24-03:34:53 MONITOR Quick Mode processing failed
2007-04-24-03:34:53 MONITOR get_ipsec_pref: Unable to find channel info for remote X.X.X.X (Firebox IP)
2007-04-24-03:34:53 MONITOR ACTION - Verify VPN IPSec Policies for X.X.X.X (Firebox IP)
2007-04-24-03:34:53 MONITOR WARNING - No Matching IPSec Policy found for X.X.X.X (Firebox IP)
2007-04-24-03:34:53 MONITOR Deleting old phase 1 SA for X.X.X.X (Firebox IP)
2007-04-24-03:34:52 MONITOR Quick Mode processing failed
2007-04-24-03:34:52 MONITOR get_ipsec_pref: Unable to find channel info for remote X.X.X.X (Firebox IP)
2007-04-24-03:34:52 MONITOR ACTION - Verify VPN IPSec Policies for X.X.X.X (Firebox IP)
2007-04-24-03:34:52 MONITOR WARNING - No Matching IPSec Policy found for X.X.X.X (Firebox IP)

Any help on this would be great.
Thanks in advance.