TMS zl Management and Configuration Guide ST.1.1.100430

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Troubleshooting
Troubleshooting the TMS zl Module in Routing Mode
3. Verify that the firewall access policies allow the following traffic:
Traffic between local and remote endpoints (which initiate the GRE
tunnel)
The correct zone for the remote endpoints is the Firewall Zone
Association configured in the GRE tunnel settings.
GRE traffic between the TMS zl Module and the remote gateway
The access policies should specify the module’s and the remote
gateway’s actual IP addresses (not the addresses for the tunnel
interface).