I have Fortigate v6.4.5, and my peer has Cisco. I have setup an IPSec Tunnel, and I have repeatedly checked the settings, they are the same. Phase1 is up but Phase2 isn't up and it keeps giving error in negotiating progress IPsec phase 2.
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You need to run "IKE debugging". That would tell you, or imply you, what part of phase2 either of them didn't like.
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