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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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An STA Cannot Associate with an AP

An STA Cannot Associate with an AP

Common Causes

This fault is commonly caused by one of the following:

  • The STA is distant from the AP and receives weak signal.
  • A large number of interference sources exist around the AP.
  • The STA has been added to the blacklist.
  • An incorrect password is entered on the STA.
  • WEP shared key authentication is configured on the AP and an STA directly connects to the AP by selecting the scanned SSID.
  • The dot1x enable command is not executed globally after WPA/WPA2 PSK authentication is configured on the AP.

Troubleshooting Flowchart

Figure 27-3 shows the troubleshooting flowchart.
Figure 27-3  Troubleshooting flowchart for an association failure between the AP and STA

Troubleshooting Procedure


Saving the results of each troubleshooting step is recommended. If your troubleshooting fails to correct the fault, you will have a record of your actions to provide Huawei technical support personnel.


  1. Check whether the STA receives weak signals from the AP.

    Check whether an antenna is installed on the AP.

    • If no antenna is installed, install an antenna on the AP or move the STA towards the AP.
    • If an antenna has been installed, go to step 2.

  2. Check for interference sources around the AP.

    Check whether there are other wireless devices using the 2.4 GHz frequency band or interference sources around the AP, such as other APs, microwave ovens, or wireless keyboards and mice.

    • If there are interference sources, turn off these devices and connect the STA to the AP again.
    • If there is no interference source, go to step 3.

  3. Check whether the blacklist or whitelist function is enabled.

    • If the whitelist function is enabled, run the display sta-whitelist command to check whether the STA is added to the whitelist. If not, add the STA to the whitelist.

    • If the blacklist function is enabled, run the display sta-blacklist command to check whether the STA is added to the blacklist. If so, remove it from the blacklist.

    • If the blacklist or whitelist function is disabled, go to step 4.

  4. Check that the password entered on the STA is correct.

    • If the password is incorrect, enter a correct password.
    • If the STA password is correct, go to step 5.

  5. Check whether WEP shared key authentication and encryption is configured on the AP.

    • If WEP shared key authentication and encryption is configured on the AP, manually configure an SSID on the STA and then enter the correct password. If you enter the password without configuring an SSID, association may fail.
    • If WEP shared key authentication and encryption is not configured, go to step 6.

  6. Check whether WPA/WAP2-PSK authentication is configured on the AP.

    Run the display current-configuration command to check whether 802.1x authentication is enabled.

    • If 802.1x authentication is not enabled, run the dot1x enable command in the system view.
    • If 802.1x authentication is enabled, go to step 7.

  7. Collect the following information and contact technical support personnel:

    • Result of the preceding procedure
    • Trap, log, and configuration information

Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 450368

Downloads: 4307

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