I'm having a challenge troubleshooting a 1 way VPN tunnel terminating at my Cisco 3620 router and customers Checkpoint Firewall. After debugging the crypto I know the tunnel is built and I can successfully send ICMP traffic into their internal network, however TCP traffic doesn’t flow. The customer indicates he doesn’t see TCP traffic hitting his Firewall. I have 2 other VPN connections built in a similar configuration and they work fine TCP and ICMP. I've run out of ideas.