IPad & iPhone wifi sync stopped working

Question

It's been since I upgraded my iPad 2 and iPhone 4 to 5.0.1 that I cannot wifi sync my devices.
I have a 2006 White MacBook with OS X 10.6.8, both iDevices upgraded to 5.0.1, last itunes version. My router is a linksys WRT54GL with the latest original firmware. Wifi security is WPA2 personal, TKIP+AES. OSX firewall is set to off.  I am an IT engineer.
I have searched over net and looked for possible solutions here, so these are the procedures I tried:
restarting my mac, iDevices, and router
updating firmware on my linksys router to the latest available
turned off iphone while trying to see if itunes detects the ipad
renew the dhcp lease on the ipad, and macbook
set a static IP both for mac and ipad
disconnect permanently the ipad from the router's wifi, then reconnect to it typing the password
switch off both ipad and mac wifi.
Remote app IS indeed working to control iTunes
disable router's multicast filter: when I did this, my roommate, who has a win7 pc and an ipad2, was able to see its ipad in itunes, and he successfully synced
disable router firewall
create a custom wifi network with my macbook and connect only the ipad to it
changing wifi channel
set up port forwarding rules for TCP:123, 3689, UDP:123, 5353 to my mac static dhcp ip address
using another network @ work
I'm running out of creativity... This problem must rely on apple side, since my roommate can sync wirelessly.
And since his ipad is working, there must be something wrong with itunes for mac, or in the way ipads interact with Macs.
The wifi sync DID work while on iOS 5.0.0, it all started after upgrading.
In any case I will not restore any of my devices, since it is not a problem caused by me.
Please Apple, fix this!  Let me know if you need any logs.
Thanks,
Riccardo

Answer 1

I looked into the Console to see what is going on.
This is what I found showing up when I set airplane mode off, and the ipad was set to sync wirelessly:
Dec  5 03:15:03 MacBook-Chicchi-2-Ghz com.apple.usbmuxd[21]: _SendAttachNotification (thread 0x7fff7105acc0): sending attach for device 58:1f:**:**:**:**@fe80::****:****:****:****._apple-mobdev._tcp.local.: _GetAddrInfoReplyReceivedCallback matched.
Dec  5 03:15:03 MacBook-2-Ghz com.apple.usbmuxd[21]: MuxNetworkInitiateConnect Client 0x10032c240-usbmuxd/NULL requesting attach to 4a2287ed14eef1769380582d13288cfd930f67a0:62078 failed, could not begin background connection attempt: -1
Dec  5 03:15:03 MacBook-2-Ghz com.apple.usbmuxd[21]: HandleUSBMuxConnect Client 0x10032c240-usbmuxd/NULL MuxNetworkInitiateConnect failed
Dec  5 03:15:03 MacBook-2-Ghz usbmuxd[21]: AMDeviceConnect (thread 0x102404000): Could not connect to lockdown port (62078) on device 31 - 4a2287ed14eef1769380582d13288cfd930f67a0: 0xe800006b.
Dec  5 03:15:03 MacBook-2-Ghz usbmuxd[21]: _AMDevicePreflightWorker (thread 0x102404000): Pair worker could not connect to lockdownd on device 31: 0xe800006b.
Dec  5 03:15:03 MacBook-2-Ghz com.apple.usbmuxd[21]: HandleDeviceAttachHelperCallback preflighting failed for WiFi device 0x1f-192.168.2.202:0: 0xe800006b. Ignoring device.