iPhone backup not working - "session could not be started" error

yayay same trouble here....cant back up omgg.....help plsss

My backups have worked fine after updating to iOS 4.0.1 and iTunes 9.2.1 ... up until today. I have an iPhone 3GS and am getting the "session could not be started" error. I haven’t done anything particularly odd on the phone though I have updated a few apps since my last backup, done a lot of SMS and a few calls, taken some photos, and sent an MMS (this last is rare for me).

In ~/Library/Logs/DeviceLink/AppleMobileBackup.00.log, I see:

2010-08-06 14:50:25.338|AppleMobileBackup|262:39694336|SocketStreamHandler.c:_SocketLogCal lback| ERROR: SocketRecv (data): return of 0 bytes
2010-08-06 14:50:25.391|AppleMobileBackup|262:39694336|StreamHandler.c:_ReadFunc| ERROR: Error reading data: Can't read data
2010-08-06 14:50:25.391|AppleMobileBackup|262:39694336|DeviceLinkConnection.c:_DLCheckVers ionForConnect| ERROR: Could not receive message: '(null)'
2010-08-06 14:50:25.392|AppleMobileBackup|262:39694336|SocketStreamHandler.c:_SocketLogCal lback| ERROR: SocketSend (data): error 32: Broken pipe

Presumably this indicates that the software on the phone has got a problem, but it’s not obvious from these logs where the problem is.

I can't seem to find an answer for this issue, any more suggestions on this fix?

Message was edited by: cmdude

I couldn't find a solution to this and had to factory-reset the phone. Not nice.

PS: Glad to have switched to an Moto Droid and a Palm Pre.

I was able to resolve this (on a Macintosh system) by removing my old backup, and then removing all of the files found in the two folders

~/Library/Lockdown/

and

/var/db/lockdown/

This allowed me to both back up my phone again, and upgrade to 4.0.2.

I think it basically causes the phone to forget about the computer and treat it as a new one, at least for the purposes of backing up.

I'm having the huge issue of my iPhone 3Gs failing to be backed up by iTunes. I know how to remove my old backup, but where do I find the following files so I can remove them?

~/Library/Lockdown/

and

/var/db/lockdown/

I found this on Apple's site: http://support.apple.com/kb/HT1766 there is an article here telling you where to find your backups. I have this problem too; I couldn't back up or update so I did a restore to new and it updated. It didn't recognise that there was a backup there so it wouldn't restore and it still won't backup even though it has done an update.

I have the same issue. But, I dont have a file called named "lockdown" on my computer ( nothing on spotlight)... I am using 10.5.8 so any ideas?

I have the same error message. Have been able to back up my 32gig 3GS on a separate Macbook. The only difference seems to be that I downloaded 4.02 software for the iphone on my problem computer, Macbook pro and not on the Macbook, otherwise they are both running all the latest software. I have tried trashing and reinstalling iTunes (recommended by applecare) and throwing away my saved prior backups of this phone. Nothing has worked yet. I'm a little nervous about throwing away files in terminal. What are the lockdown files?

Thanks

Thank you very much, Anton. This issue has been driving me crazy for weeks.

I have no such folder as

~/Library/Lockdown/

but I do have

/var/db/lockdown/

after removing the file found there, everything worked the way you say.

Spotlight doesn't search hidden directories. You will need to use the terminal in this case.

Just to confirm this worked for me also. Thanks

Worked for me eventually after some sort of overide