Troubleshooting a Cisco Router VPN tunnel

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.
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Assuming that you have an access-list to define interesting traffic to be encrypted, enable logging of the ACL, then see if the traffic you are attempting to send is matching the acl (and hence being encrypted on your ends).

Also ensure that the ACL's that you are using match identically on both ends.
Don JohnstonInstructorCommented:
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