iTunes Error 42408 After 9.03 Upgrade

I am having the same problem on a Windows XP laptop. My iPod will not sync my purchased content due to this error. Of course, there was no problem purchasing it and downloading it to my machine, but I can't access any of it from my iPod because it's not on there. It is very frustrating, especially considering the amount of time between iTunes releases where, I'm assuming, these kinds of problems are debugged in testing ahead of time. Hopefully a patch will be implemented soon if it is, in fact, update-related. If not, I'm at a loss.

Same here - just did the upgrade and it has thrown me out - and refuses to accept my password. And because of that, it has de-authorised my computer and cleaned out a load of the songs *that I have paid for * Grrrrrrrrrrrrr.

I get that exact problem - right after the upgrade.

I got the same problem. I tried to restore factory settings to my ipod then reauthorize it but it didn't work.

I took the risk to deauthorize and (re)authorize my computer, and now it works. I could successfully sync my iPod with the purchased content.

I'm getting the same error, and continually get the -42408 error when attempting to reauthorize. Anyone figure this out yet?

I had the same problem. Check the version of iTunes via the About dialog. Mine said 9.0.2 despite having upgraded via system updates, itunes and even downloading the whole package again.

Turns out, the dock iTunes link is running the old one. Basically, remove it from the dock, and re-drag the itunes from the applications folder back onto the dock. This then started 9.0.3 for me, and my iTunes account worked, the itunes store worked and iphone sync worked as well. Phew.

Check the bottom of this page for my reference http://support.apple.com/kb/HT2311

Bizarrely this doing exactly this has fixed it for me. This is despite only having one copy of iTunes installed here.

Don't sweat it, folks ... I just fixed it by de-authorizing manually (Advanced - Deauthoize) and when prompted to enter my password, I did, and now its all good!

Neither removing Dock icon, nor de-authorise fixed the issue for me. De-authorise results in the same error code.

From another Mac, deauth and auth worked first time.
This Mac, still no joy.

Just downloaded the iTunes 9.0.3 installer, and tried re-installing.
Still getting the same error code.

OK, I have fixed it here. Here's what I did:

quit iTunes
trashed ~/Library/Preferences/com.apple.iTunes.plist
started iTunes, and authorised my account

Worked straight away after that !

Okay, I have a fix that seems to have worked. You need to be able to access your iPod from your system's explorer. Make sure iTunes is closed. On your iPod you will find a file named iTunesPrefs.plist and another named iTunesPrefs with no extension. Cut and paste those two files somewhere else on your hard drive. Following, start up iTunes and attempt to Authorize/Deauthorize and it should work.

BTW These files on my iPod were under /iPod_Control/iTunes. Hope that didn't cause any confusion.