H3C s3600 series Command Manual page 598

Before enabling Web authentication globally, you should first set the IP address of the Web
authentication server.
Examples
# Set the IP address and port number of the Web authentication server to 192.168.0.56 and 80.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] web-authentication web-server ip 192.168.0.56 port 80
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