ESP Encapsulated Security Payload - is where the data goes.
If ESP is stopped by the firewall (either side) or if individual protocols/services (UDP/TCP ports) is stopped after the VPN tunnel termination point, all or some traffic might be blocked.
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pfw: 65534 Deny P:50 10.0.x.x 62.x.x.x in (VPN PIX501)
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