iTunes Error 42408 After 9.03 Upgrade

Completed items #1-5 and reconnected iPhone. Iphone synced (sank?) with iTunes and went through all 25,000 photos, etc to "optimize" them and then completed sync satisfactorily. This was the first time in weeks this had completed this process.... Apple owes you big time!!!
Thanks..

I wanted to share that I have 7 iPods and all of them have had to require a reauthorization since Mid-Feb 2010. Apply must have done something structurally with the old ".Mac" accounts that required this.

That said, I have reset factory settings on a couple of them and re-sync'ed. This seems to work for each individual iPod. But, it is time consuming and for my larger HD iPods I wanted a different approach. I used both and found that I had to use the second option, remove the SC File and this seems to have resolved the issue. It seems like I had to reauthorize using the new ".me" and my other associated email address and all is now great.

Thanks for the information - don't know that I could have figured it out without much more time.

I, too, dumped iTunes 9.0.3 and reinstalled 9.0.2.

Problem seems to be solved.

Great, First way worked for me!
Thx so much...

This method worked for me on my Mac as well. Thanks Dez.

Thanks for the help. Removing i-Tunes from the dock and re-installing from applications seems to have worked. At least I can now play tunes from my computer. Will check out the i-pod this pm. Shame on Apple.

This is getting really weird. I've tried every trick out there and it only temporarily spares me the "unknown error".

-I deleted the SC files (turns out I had three downloads in line)
Worked for two days.

-Deauthorized my computer and authorized it again.
Worked for a couple of days.

-Change Itunes icons to make sure I'm using the right one.
Did not imporove situation.

-Changed my user account settings
That worked for a coupl of hours.

I can play all the mucis that I have bought, but not the movies, tv shows and I can't buy anything else. I'm pretty upset that I'm locked out of using things I paid for.

Oh yes, my Itouch likes to say that I need to format it each time I plug it in.

I am not having any luck with these options.

I am running Windows 7 - ITUNES 9.0.3
Everytime I connect my IPOD I have to do a restore now. Just last Sunday - there were no problems. All week I can't purchase anything and get error 42408 just like anyone else here.

I did the SC folder thing. I tried reauthorizing my computer and get same error. I am so ready to scream.

How do you roll back to previous version? I do not have the previous version copied to my hard drive to try and reinstall it.
Any help would be appreciated. Thanks

Removing the SC Info folder worked for me. Thanks.

Now I can't play the rented movies I have on my computer. I played one of them this morning and now can't play the others......

This ***** -
Can't purchase anything
Anytime I connect my IPOD to my computer I have to do a complete restore
Can't watch rented content which i was able to this morning

Any of the fixes listed here has not worked for me....

Hey Apple, get off your a** and fix this problem. You've been aware of it for months. Every time I stop in the Apple Store to get a status on the patch, they tell me it will be out in a couple days. This has been going on for 3 weeks. You're all over raising song prices, but you don't seem to be responsive to your customers' problems. You're acting more like MS every day. I will not spend one more dime on an Apple product until this is resolved, and I encourage all others to do the same. Maybe that wil motivate you.

This is the solution that worked for me.

Er, that is, trashing the preferences file in my Library.

The store is finally working for me. I did not change anything on my end....

I called Apple and they told me to quit iTunes, open Safari and empty the cache (Safari Menu) and quit Safari and reopen iTunes and the problem resolved. The problem is intermittent so we'll see.
the tech referred m to tech doc which i could not locate but so far it works. couldn't hurt to try it

I had this problem a month ago and it was fixed after de-authorizing and reauthorizing my computer. This time when I e-mailed support they de-authorized it on the back end and when I go to re-authorize it I get a different error, now I will have to back up my entire library and re-install iTunes. We'll see if it works...I only wish that I could install an older version of iTunes, as Apples engineers plainly can't get a handle on this bug in this one.