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 to 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?
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

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.
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.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
cef_soothsayerAuthor Commented:
My counterpart on the Fortigate side found the problem after some research.  I have posted the solution above.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.