The problem may be with the Wired Equivalent Privacy (WEP) encryption. To address this issue, disable and reconfigure WEP. As an alternative, you may upgrade the firmware.
When a repeater Access Point cannot communitcate to a root AP, it pays to troubleshoot the problem as you would most other client-to-AP connectivity problems.
See the following pages for more troubleshooting information:
Associated but cannot pass any traffic
Associated but cannot pass traffic to some devices