When using the "Add Scanner" wizard to add a freshly installed Messaging Gateway (SMG) scanner that is running 10.6.5 or earlier to a Control Center running 10.6.0 or later, the scanner cannot immediately update its version to match the Control Center.
On versions before 10.6.0, secure tunnel to the software update repository is not automatically started following license registration.
A restart of the scanner host using the command line reboot
command will start the secure tunnel process and allow the Add Scanner wizard to update and add the scanner host.