After accepting an auto update to the kernel which installed kernel 220.127.116.11-76, Fedora 9 failed to connect to WPA enabled wireless networks. The network manager applet kept attempting to connect and failing, repeatedly prompting for the WPA key without any success. Attempting to connect manually using the iwconfig commands also failed when attempting to obtain a DHCP lease using dhclient. Connecting to a WEP network succeeded, suggesting that the problem lay with WPA support. Restarting the wpa-supplicant service with service restart wpa_supplicant failed with the error Starting wpa_supplicant: /etc/wpa_supplicant/wpa_supplicant.conf, , dbus_bus_request_name[dbus]: Resource temporarily unavailable. At this point I was stymied with no possible solution coming to mind except reverting back to the old kernel, which worked perfectly. Judging by the bugzilla report, the problem appeared to be related to a couple of wireless fixes incorporated in to the kernel.
At this point, I decided to wait a couple of days for an updated kernel to be pushed through the auto-updates. But since none seemed to be forthcoming, I downloaded kernel-18.104.22.168-86.fc9.i686 from Koji (http://koji.fedoraproject.org/koji/buildinfo?buildID=55121) and installed it without any problems using yum.
sudo yum --nogpgcheck localinstall kernel-22.214.171.124-86.fc9.i686.rpm kernel-devel-126.96.36.199-86.fc9.i686.rpm kernel-headers-188.8.131.52-86.fc9.i386.rpm
The new kernel fixes the WPA issue and my wireless network is back online again. If you are experiencing the same problem, I recommend the latest kernel build, which is working perfectly for me at the moment.