Hello@user_3582781,
Ensure that the Huawei router has a public IP address and the public IP address can be pinged from the public network. The command line is as follows: https://x.x.x.x:8443 (x.x.x indicates the interface address of the router).
<Huawei> system-view
[Huawei] undo http server permit interface
Change the HTTP port number for web login to 8090 and the HTTPS port number to 8443.
[Huawei] http server port 8090
[Huawei] http secure-server port 8443