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The Cisco IOS Firewall with VPN Tunnel drops tcp packets and the "Invalid Segment tcp" error message appears

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Core issue

This issue occurs due to the presence of Cisco bug ID CSCsg37315.

This issue occurs when VPN tunnels are configured on the router in conjunction with Context-Based Access Control (CBAC).

When this issue occurs, the Invalid Segment tcp error message appears.

Resolution

For a workaround:

Disable the hardware encryption on the router with the no crypto engine accelerator command.

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