無人アクセスは有料化っぽいな

Changes to Hamachi on November 19th | The official LogMeIn product blog
http://b.logme.in/2012/11/07/changes-to-hamachi-on-november-19th/

If no user is logged on to the computer then – even though the Hamachi service or daemon is active in the background – it will not go online in any networks that it may belong to.
We believe this a fair change;

if you're using Hamachi casually (such as for gaming), then we're glad to have you as a free user and this change does not affect you.

If, on the other hand, you're using Hamachi to access unattended computers, then this change does affect you and you will want to upgrade to the premium service in order to continue to benefit from it.