We set up the route-based (site-to-site) VPN between Azure virtual gateway and the physical VPN gateway at our branch office. The VPN tunnel was established and the traffic can go though the tunnel bidirectionally, but after a few days, the VPN tunnels
stopped working. The VPN log at the physical VPN gateway shows that the Azure virtual gateway sent back the notification message with the error code - "12345". I couldn't find any info about this error code from the IKEv2 RFCs. Is there any idea
or suggestion about how to troubleshoot this issue?
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