You can not debug the traffics before the decryption on your side because that traffics are encrypted.
I am assuming the followings:
- no ACL blocking on your VPN router,
- your router is running code 12.4(20) or higher,
you can then enable the Embedded Packet Capture (ECP) on cisco router on the LAN side of the VPN router facing your webserver. Now if you see traffics for port 80 from the other side trying to hit your web server, than you know that the traffics for port 80 from the customer is making over the VPN. Next thing is to find out if you see return traffics for port 80 hitting the LAN side of the VPN router. If you do not see reply for port 80 traffics, the issue is on your end prior to hitting the VPN router
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