iTunes Error 42408 After 9.03 Upgrade

I looked for the files to do the fixes - there's no file in my Preferences named com.apple.iTunes.plist (and yes, I AM looking in the right Preferences folder), and I can't find any iTunesPrefs.plist on my iPod either. After a restart, I tried to authorize and iTunes told me I was already authorized - but when I tried to sync my iPod, iTunes said I wasn't authorized. I deauthorized and reauthorized my macbook pro. Same response, so I don't know what's going on.

Trashing preferences has not worked for me, I have same authorization issue/error returned from iTunes store.

I'm having the same issue. I tried to deauthorize, but it doesn't accept my username and password. It doesn't recognize my 30 gb ipod or my 8 gb touch.

I think in order to see those files you need to have "Enable Disk Use" checked for your iPod.

Yes, enable disk use is checked. But the only folders I see are the ones I created to hold files.

I have the same problem.
I guess that there will be a patch soon...
er or later.

Same for me, although my info window showed iTunes 9.0.3.

I de-authorised all 5 computers before reading this thread. Removing iTunes from the dock and dragging the correct one from the apps folder allowed me to re-authorise. Only got four more to do now!

There was a "Library/Preferences/com.apple.iTunes.plist" file lying about on my desktop (from an old backup). The problem was fixed after trashing it.

Thank-you Dez Chesterfield

I was able to deauthorized/authorize this computer and all is fine again.

My version is 9.0.3.15 and I am getting this message. I did send itunes and email and they said they are working on this.

Did not work.

I can't believe they can't fix this problem. I called for support and they directed me to the chat. The girl had one solution for me and then told me to look on this blog. I called and chatted with her to fix the problem, not so I could do my own research and look up stuff all night long.

If it helps, this is how I finally solved my problem. Since my computer seemed to be authorized, and only some of my songs were generating the "not authorized" problem, I took another look at the login dialog - it was asking for my old, original .mac login, which I had let lapse a long LONG time ago. So I thought, what have I got to lose? and logged into that old dead account (after answering the security question and changing the password). That was all it took. The songs that were not authorized to play suddenly were OK again. Apparently if you bought songs from another account, or changed login name or anything, you have to go back to that to authorize your current setup to play them.

Worth a try, anyway, if the repeating "not authorized" dialog is showing you an old user name.

Tried with no success - painful. Apple, how about a little love for the home team?

Hello all,

If you are experiencing the -42408 error syncing with a iPod or iPhone after updating to iTunes 9.0.3, please try these steps:

1. Eject and disconnect the iPod/iPhone from the computer.
2. Open iTunes.
3. Find a protected song from the iTunes Store (Kind = Protected AAC audio file) in your library.
4. Play the song.
5. Connect your iPod/iPhone.

Do you still get the error? If so, try these steps:

1. Carefully follow the steps in the "Remove the SC Info folder" section of this Knowledge Base document: http://support.apple.com/kb/TS1389
2. Re-authorize your computer: Store menu > Authorize Computer...
3. Sync your iPod or iPhone.

Do you still get the error?

Please report your results back here, and if one of my suggestions helped, let me know which one.

Thanks,
Roy