Try to config the Pix (50x) firewall for supporting the VPN. The problem is the inside (of the firewall)web serve's IP address is NOT static but dynamically assigned by the ISP provider.
In this case how can I configure the Pix (50x) firewall?
Is your web-server registered with DNS ? If so, don't you think it should have a static IP ? Any ways, you can try dynamically forcing any ip given by ISP to a constant private IP. Use this command in interface config mode : ip address negotiated
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