This case is for the scenario where the Huawei firewall receives the private IP of the DSL modem. In order for redirection to take place, the DSL modem must NAT from the public IP to the private IP, noting the port used, in this case 4433:

1. SSL VPN configuration must be created in the firewall.

2. In the security policy that releases VPN access to the Internal network, you need to specify HTTPS and the SSLVPN port, which in this case is 4433: