What Do I Do If a VPN Connection Is Interrupted and a Message Indicating Data Flow Mismatch Is Displayed?

This is usually caused by ACL configuration mismatch between the local and customer gateways.

Verify that at the two ends of the VPN connection, the local and remote subnets are reversed and the ACL configurations are also reversed.
Use the subnet/mask format when you configure interesting traffic in your on-premises data center. Do not use the address object mode since it may cause incompatibility issues.

Parent topic: Connection or Ping Failure