Why can't the web authentication page pop up?

Why can't the web authentication page pop up?

You can perform the following steps to identify the issue:

Step 1: Check whether the terminal PC successfully obtains an IP address.

1)    On the terminal, run ipconfig/all to check the IP address.

2)    On the N18K, run show ip dhcp binding | include xxxx.xxxx.xxxx (user MAC address).

Step 2: Check the terminal PC connectivity.

1)    Run arp –a to check whether the terminal has successfully learnt the ARP information of the gateway.

2)    On the terminal, ping a common website to check whether the DNS  is normal. By default, the DNS protocol is bypassed for web authentication.

3)    On the terminal, ping the IP address of the Portal server. If the ping fails, check whether N18K bypasses the Portal IP address, for example, http redirect direct-site 172.18.18.35.

Step 3: On the N18K, run show arp | include IP to check whether the terminal has correctly learnt the ARP entry of the corresponding PC.

1)    If the ARP entry is dynamically learned and the MAC address is not the actual terminal MAC address, you can run clear arp IP address to clear the address to perform fast recovery.

2)    If the ARP entry is learnt in static mode, and the MAC address is not the actual terminal MAC address, you need to check the online entry of the web.

3)    If the queried information of the online user is inconsistent with that on the terminal, information residual of the online user may occur. This issue can be rapidly recovered by running the commands clear web-auth user ip x.x.x.x and clear ip dhcp binding x.x.x.x.