Getting Phase 2 issues on Sonicwall to Fortigate VPN

I have a Sonicwall TZ firewall and I am trying to set up a VPN to a Fortigate Firewall.  I control the Sonicwall and a 3rd party controls the Fortigate.  We have gone over the configuration step by step a dozen times to make sure our settings match.

We are using Main Mode / AES-256 / DH5 / SHA1 / 28800 for Phase 1.  We are using ESP / AES-256 / DH5  / SHA1 / 3600 for the phase 2 settings.  Subnets on each side are 192.168.173.0/24 to 192.168.10.0/24 respectively.

Phase 1 negotiation completes, but Phase 2 does not.  The Sonicwall Logs says phase 2 quick mode start.  But there is never a reply.  the IKE negotiation eventually times out.

Any ideas?
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cef_soothsayerAsked:
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JohnBusiness Consultant (Owner)Commented:
A couple of things to try:  Run PFS OFF. I do not use this. Try turning NAT ON (normally in Advanced Settings). Make sure your Pre-shared key is correct.
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cef_soothsayerAuthor Commented:
Ok, we got the Phase 2 to complete.  It was a problem on the Fortigate side.  The "Quick Mode" selectors were not saving their settings correctly.  A firmware update fixed it.

Now we have a greenlit tunnel, but no IP traffic flows through it.  We can see the traffic leave the sonicwlal, and we can see it hit the Fortigate WAN side, but that's as far as it gets.  The tech on the Fortigate side is still troubleshooting - potential issues with corrupted FW rules.

Thanks.
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cef_soothsayerAuthor Commented:
My counterpart on the Fortigate side found the problem after some research.  I have posted the solution above.
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