I bought a new iMac and transferred all data from my old Macbook Pro to it. I cannot initiate Time Machine backups for my iMac, owing to Keychain error -25299. I'm running Sierra on the iMac. What can I do to resolve the Keychain error? Thanks in advance.
iMac, iOS 10.1
This error is popping up quite a bit.. the error code is different in some cases but the method for fixing it is the same.
You need to boot to recovery and apply some commands.
See. Keychain error - time capsule
Unfortunately it does not always work. So this is current post with yours.
Ugh. Keychain error 10001 when trying to setup backup disk in time machine.
Since you have a new Mac ring Apple and get them to talk you through it.
AirPort and Keychain error -25299
