Signup client for Macintosh does not start correctly and the Mac boots to a blue screen.

When I install the latest version of the Signup client for Macintosh from the Pharos website, the Macintosh appears to hang at a bluescreen upon reboot. After this I am not able to login and have to uninstall/re-image the Mac for it to be functional again.

Pharos Support is aware of an issue affecting some Mac systems, and is working on an appropriate solution. Any further updates will be added to this Knowledge Base article.

At this time, the problem is believed to be related to DNS resolution failing early in the boot process. To work around this, you can try adding your SignUp Server hostname to your /etc/hosts file, or altering the SignUp Client property list with the following command:

defaults write /Library/Preferences/com.pharos.signup "Server Address" $(dig -q $(defaults read /Library/Preferences/com.pharos.signup "Server Address") +short)

This command (all one line) needs to be run either before you reboot into the SignUp client the first time, or via an ssh session.

If you wish to disable the SignUp client and restore the Mac to its original login configuration, you can perform the following steps in single user mode, or via ssh if you have remote login enabled on the Mac. For ssh, you must log in as an Administrative user.

1. Change Directory to the '/etc' directory:

   cd /etc

2. Replace the authorization file with a backup:

   sudo cp authorization.backup authorization

   Enter your password when prompted.

3. You should recieve no error messages and see a new line with the shell prompt. This means the comand has completed correctly.

4. Reboot the machine:

   sudo reboot