The user cannot be found on the AC after the user has gone online and obtained an IP address

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If a user cannot be found on the AC after having gone online and obtained an IP address, check whether Portal authentication is configured on the AC. If yes, user information is displayed on the AC only after the user is authenticated successfully.

Other related questions:
The destination IP address cannot be found after an ACL rule is configured on the AC
The possible cause is that the wildcard of the destination IP address is set to 255.255.255.255, causing the ACL rule to match all packets.

DHCP clients fail to obtain IP addresses from the DHCP server on the AR
The causes that DHCP clients fail to obtain IP addresses from the DHCP server are as follows: - The configuration is incorrect. - There is no allocable IP address in the DHCP address pool. - STP is enabled on upper-level access devices of some diskless workstations. For details on troubleshooting and solutions, see AR150&AR160&AR200&AR510&AR1200&AR2200&AR3200 FAQ.
About the AR ClientExceptions occurs when the IP address is obtained. For details, see the Revelations of Troublesolving on the right page.

Why cannot users obtain IP addresses after DHCP snooping is configured
After DHCP snooping is enabled, all the interfaces on the device are untrusted interfaces by default. In this case, you need to use dhcp snooping trusted command to set the status of the interfaces connected to the DHCP server to trusted. Otherwise, the DHCP Reply messages sent from the DHCP server are discarded and users connected to the device cannot obtain IP addresses from the DHCP server.

Wireless users cannot obtain IP addresses and the device displays a message indicating that the connection is restricted or needs to be reestablished
1. The dhcp enable command is not configured in the system view. 2. The dhcp select interface command is not configured in the interface view.

Reasons why users cannot obtain IP addresses after DHCP Snooping is configured on S series switch
After DHCP snooping is enabled, all interfaces on S series switches are untrusted by default. DHCP Discover packets, however, must be forwarded from a trusted interface on the switch. Therefore, you must configure the interface connected to the DHCP server as a trusted interface to ensure that users connected to the switch can obtain IP addresses.

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