Q: my macbook air running yosemite keeps asking for my keychain password,why ?

Tutorial: Resolving Keychain Issues

If you can't access your keychain, or forget your password If you can't get into your keychain file because you've forgotten your password or the keychain file appears to be corrupt, there are a couple of options.

First, if you've forgotten your password, you can use the "Keychain First Aid" utility to make the keychain password the same as the login password. This can be accomplished via the following process:

  1. Open Keychain Access (located in Applications/Utilities)

  2. Go to the "Keychain Access" menu and select "Preferences"

  3. Click the "First Aid" tab

  4. Make sure the "Synchronize login keychain password" box is checked

  5. Close the Preferences window

  6. Go to the "Keychain Access" menu and select "Keychain First Aid"

  7. Enter your username and password

  8. Click the "Repair" button

The second option is to completely delete your keychain then recreate it. This routine is useful if your keychain appears to be corrupt or otherwise inaccessible. This can be accomplished as follows:

  1. Launch Keychain Access (located in Applications/Utilities)

  2. Click "Show Keychains" in the lower-left corner of the window.

  3. Select the problematic keychain from the left-hand pane.

  4. Navigate to the "File" menu and select "Delete Keychain '(name of keychain)'"

  5. Check all options for deletion and press "OK"

  6. Create a new keychain by going to the "File" menu, then "New" and selecting

      "New Keychain"

  7. You can now make this keychain your default if you desire by selecting it, then

      going to the "File" menu and selecting "Make '(name of keychain)' Default"

Login as root and perform repair In some cases, problems with keychains can only be resolved when logged in as the root user.

First, you want to enable the root user:

  1. OS X Mountain Lion: Enable and disable the root user

  2. OS X Lion: Enable and disable the root user

  3. Mac OS X 10.6: Enabling the root user

  4. Enabling and using the "root" user in Mac OS X

After enabling the root user, and logging in under this account, again open Keychain Access. First attempt repairs using Keychain First Aid, and failing that, delete then recreate the keychain as described above while logged in as root.

Persistently asked for stored passwords If you are persistently asked for passwords in various applications that you have specified should be remembered in a keychain, your "login" keychain may not be active for one reason or another.

Navigate to ~/Library/Keychains/ (this is the Library folder inside your user's home folder). Find the file named "login.keychain" and double-click it.

Failing that, select the "login" keychain within the Keychain Access application and make sure it is the default keychain by going to the "File" menu and selecting "Make 'Login' Default"

Turn off Keychain synchronization in applications having problems If specific applications are experiencing issues when accessing password-protected material, the Keychain may be to blame.

The above comes from an article published on MacFixit.com.

Back up all data before proceeding.

Launch the Keychain Access 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.

Select the login keychain from the list on the left side of the Keychain Access window. If your default keychain has a different name, select that.

If the lock icon in the top left corner of the window shows that the keychain is locked, click to unlock it. You'll be prompted for the keychain password, which is the same as your login password, unless you've changed it.

Right-click or control-click the login entry in the list. From the menu that pops up, select

          Change Settings for Keychain "login"

In the sheet that opens, uncheck both boxes, if not already unchecked.

From the menu bar, select

          Keychain Access ▹ Preferences... ▹ First Aid

There are four checkboxes in the window that opens. Check all of them. if they're not already checked. Close the window.

Select

          Keychain Access ▹ Keychain First Aid

from the menu bar and repair the keychain. Quit Keychain Access.

If you use iCloud Keychain, open the iCloud preference pane and uncheck the Keychain box. You'll be prompted to delete the local iCloud keychain. Confirm. Then re-check the box. Follow one of the procedures described in this support article to set up iCloud Keychain on an additional device.

Did you ever find a permanent resolution for this?

I have seen this across some 50 macs that have been upgraded to 10.10.3 and none of the suggested solutions here have been effective for me. I already knew to try some of these steps, and even after completely deleting and recreating the login key chain, I still have issues. The weird thing is, across some reboots, the machine acts just fine, across others, it's every few minutes. There doesn't seem to be any rhyme or reason to it..

If nothing else, I am going to open a ticket within my Apple OS Enterprise Support account, and will post any results here.

Any help is greatly appreciated!!