When a Mac is imaged, the local KDC is imaged together with it. This causes the SHA1 key used in the local KDC to be replicated. When the image is bound to the AD, this would result in the machine being unable to bind due to replicate SHA1 keys. This is reflected at the support pages (http://support.apple.com/kb/TS1245)

To solve this, remove traces of the local KDC and reset it. Using Keychain Access, locate the com.apple.kerberos.kdc certificate and key pair in the System keychain. And delete all three entries. Then do the following commands.

sudo rm -fr /var/db/krb5kdc
sudo /usr/libexec/configureLocalKDC

This apparently addresses difficulty downloading large files from any web site where the download will begin, but it will rapidly slow down and eventually it will time out and the download will fail.

sudo sysctl -w net.inet.tcp.rfc1323=0

To disable the backups:-

defaults write com.apple.iTunes AutomaticDeviceBackupsDisabled -bool true

To enable the backups:-

defaults write com.apple.iTunes AutomaticDeviceBackupsDisabled -bool false

These commands are obtained with reference from http://www.makemacwork.com/category/time-machine. Other recommended readings includes http://www.afp548.com/article.php?story=20080109213724586. Continue reading Control Time Machine from Command Line →