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IPSEC site to site VPN fails after R80.20 upgrade


We have a large number of IPSEC VPN tunnels between our R77.30 gateway clusters.

Yesterday we upgraded one of the remote clusters to R80.20. After the upgrade the tunnel was still working fine, until we pushed policy to the R77.30 cluster late last night.

Now the tunnel will not stay up. If I push the R80.20 cluster it comes up briefly, then fails again.

The error message is 

Auth exchange: Sending notification to peer: Authentication failed MyAuthMethod: Certificates

I have support ticket open, but is there something simple and obvious I am missing?


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