Keychain error 100001 when attempting to reconnect time machine.

This procedure is a diagnostic test. It makes no changes to your data.

Please triple-click anywhere in the line below on this page to select it:

{ defaults read com.apple.security; echo; defaults read /Library/Preferences/com.apple.security; } | pbcopy

Copy the selected text to the Clipboard by pressing the key combination command-C.

Launch the built-in Terminal application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad and start typing the name.

Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.

Wait for a new line ending in a dollar sign ($) to appear below what you entered.

The output of the command will be automatically copied to the Clipboard. If the command produced no output, the Clipboard will be empty. Paste into a reply to this message.

The Terminal window doesn't show the output. Please don't copy anything from there.

If any personal information appears in the output, anonymize before posting, but don’t remove the context.

When you launch Keychain Access, is there an item named "System" in the list of keychains? If so, does it contain any items of the type "Time Machine Password?" Can you unlock the System keychain by clicking the padlock icon in the top left corner of the window?

Hello Pete,

Did you manage to solve this problem?

I'm having the same issues on my Mac.

Kind regards,

Jeroen

Boot to recovery holding CMD+R until you see the apple logo. You may have to select your Language on the next screen, or it may go straight to OS X Utilities. In OS X Utilities, at the top of the screen you have a black apple, OS X Utilities, File, Edit, Utilities. Click "Utilities" and click "Terminal". In Terminal, type out /usr/bin/chflags norestricted,nosunlink “/Volumes/drivename/Library/Keychains/System.keychain” but replace drivename with your disk name (I.E. Macintosh HD). If you see "Invalid Flag" you typed something wrong. After it finishes, you should see a bash# command. If so, click the black apple and click restart, then try backing up.

It worked perfect for me too!!!

Great! Thanks!

you saved me! Thx a lot !

Hi,

I'm trying to follow this procedure, but I can't see the Volume of my hard drive mounted in /Volumes; maybe it is because the partition is encrypted. Any alternative procedure or a way to manually mount the Volume before using the chflags command?

Thanks!

J.

Ooops, just in case, the procedure I'm following is the one mentioned here:

Re: Keychain error 100001 when attempting to reconnect time machine.

J.

just having this problem now, i did the restart in recovery method and got the proper command figured out and got the bash# response but still getting the same error when i back up?....

{

SecItemSynchronizable = 1;

}

me too - still having the same error

I am assuming this is something you type into the bash shell?

This didn't give me an error: { SecItemSynchronizable = 1; } <-- spaces are important

but also didn't make the"Re: Keychain error 100001 when attempting to reconnect time machine." error go away, even after executing

usr/bin/chflags norestricted,nosunlink “/Volumes/Masintosh HD/Library/Keychains/System.keychain”

yes, the bash shell. in recovery though. if it didn't work, not sure what to tell you. 100% effectiveness on my attempts. Call apple support.