Q: What causes STA going-online failures? How do I handle the problem?
A: You can check the STA online failure records by using the display station online-fail-record command to locate the reason for STA online failures reasons.
Reason Why a STA Fails to Go Online | Remarks | Handling Suggestion |
|---|---|---|
STA authentication times out. | - | Reassociate the STA with the network. If the failure persists, contact technical support personnel. |
Invalid association request packet. | - | Reassociate the STA with the network. If the failure persists, the STA may be incompatible with the AP. Contact technical support personnel. |
The encryption mode is inconsistent on the STA and AP. | - | Ensure that the encryption mode is consistent on the STA and AP. |
Authentication fails in the association stage. | - | Reassociate the STA with the network. If the failure persists, contact technical support personnel. |
The STA is not authenticated. | - | Reassociate the STA with the network. If the failure persists, contact technical support personnel. |
The AP does not support the rate set specified in the association request packet of the STA. | - | Change the basic rate set in the radio profile and reassociate the STA with the network. |
The encryption algorithm is inconsistent on the STA and AP. | - | Ensure that the encryption algorithm is consistent on the STA and AP. |
Failed to decrypt the challenge packet. | - | Verify that the STA works properly and reassociate the STA with the network. If the failure persists, contact technical support personnel. |
Access from legacy STAs is denied. | - | Verify that access from legacy STAs is denied. To allow access from legacy STAs, run the undo legacy-station disable command. |
The number of STAs exceeds the physical specifications allowed by the AP. | - | Expand the network capacity or retain the current configuration as required. |
The WMM capability of the STA and VAP does not match. | - | Check whether the VMM function is enabled in the radio profile or check the WMM configuration on the STA. |
STAs have a compatibility issue(Incorrect network type flag carried by STAs). | - | Verify that the STA works properly and reassociate the STA with the network. If the failure persists, contact technical support personnel. |
STAs have a compatibility issue(STAs do not support short timeslots). | - | Check whether the STA supports 802.11g. |
STAs have a compatibility issue(STAs do not support DFS.) | - | Check whether the STA supports 802.11h. |
The number of associated STAs exceeds the maximum allowed by the AC. | The number of associated STAs on the AC exceeds the maximum. | Expand the network capacity or retain the current configuration as required. |
The STA is not in the global whitelist. | - | Check whether the STA needs to be added to the global whitelist. |
The STA is in the global blacklist. | - | Check whether the STA needs to be added to the global blacklist. |
The STA is not in the VAP's whitelist. | - | Check whether the STA needs to be added to the VAP's whitelist. |
The STA is in the VAP's blacklist. | - | Check whether the STA needs to be added to the VAP's blacklist. |
The STA associates with a heavily loaded radio. | - | Check whether the threshold for load balancing is proper. |
The STA is in the dynamic blacklist. | - | Check the attack records and check whether the STA has initiated attacks. |
The association or reassociation packet check fails. | - | Reassociate the STA with the network. If the failure persists, contact technical support personnel. |
The number of users exceeds the maximum allowed on the VAP | - | Expand the network capacity or run the max-sta-number command to increase the maximum number of STAs associated with the VAP. |
The STA uses a static IP address. | - | Check whether the STA uses a static IP address. If not required, configure the STA to obtain an IP address dynamically. |
The STA's SNR is below the user CAC threshold. | - | Check whether the SNR-based user CAC threshold is proper. To change the threshold, run the uac client-snr threshold command. Reassociate the STA with the network. Alternatively, determine the STA location and provide coverage to the location. |
The number of STAs exceeds the UAC threshold of the radio. | The number of associated STAs exceeds the user CAC threshold based on the number of users. | Check whether the user CAC threshold based on the number of users is properly set. If not, modify the threshold by running the uac client-number threshold command and reassociate the STA with the network. |
The channel utilization of the radio has reached the upper threshold. | - | Check whether the user CAC threshold based on the channel utilization is proper. To change the threshold, run the uac channel-utilization threshold command. Reassociate the STA with the radio. |
The STA does not send an authentication request before associating with the network. | - | Reassociate the STA with the network. If the failure persists, contact technical support personnel. |
The key is incorrect or the STA uses the cached PMK. | - | Ensure that the STA uses the correct key and reassociate the STA with the network. If the failure persists, contact technical support personnel. |
Failed to receive the handshake packet (2/4) from the STA. | - | Ensure that the STA uses the correct key and reassociate the STA with the network. If the failure persists, contact technical support personnel. |
Failed to receive the handshake packet (4/4) from the STA. | - | Ensure that the STA uses the correct key and reassociate the STA with the network. If the failure persists, contact technical support personnel. |
WAPI authentication times out. | - | Check the network quality and reassociate the STA with the network. If the failure persists, contact technical support personnel. |
Reauthentication fails. | - | Check the intermediate network connectivity between the AP and AC, and reassociate the STA with the network. If the failure persists, contact technical support personnel. |
Authentication fails. | - | Reassociate the STA with the network. If the failure persists, contact technical support personnel. |
The authentication request times out. | - | Reassociate the STA with the network. If the failure persists, contact technical support personnel. |
Key negotiation fails. | - | Ensure that the STA uses the correct key and reassociate the STA with the network. If the failure persists, contact technical support personnel. |
Exceeded the maximum number of users on the central AP. | The number of associated STAs exceeds the maximum allowed by the central AP. | Expand the network capacity or retain the current configuration as required. |
Key negotiation fails(the length of the key data(2/4) is invalid). | - | Verify that the correct password is entered on the STA. If this fault persists, contact technical support personnel. |
Key negotiation fails(the length of the key data(4/4) is invalid). | - | Verify that the correct password is entered on the STA. If this fault persists, contact technical support personnel. |
Key negotiation fails(fail to send the handshake packet). | - | Verify that the correct password is entered on the STA. If this fault persists, contact technical support personnel. |
Key negotiation fails(the key infomation of the handshake packet is invalid). | - | Verify that the correct password is entered on the STA. If this fault persists, contact technical support personnel. |
The radio type is inconsistent between the AC and AP. | - | Run the display ap config-info command to verify the AP radio configuration. |
For troubleshooting methods, see STAs Fail to Associate with a WLAN.
