Apr 27, '09 07:30:03AM • Contributed by: NoLongerAnon
For some time now, Back to My Mac (BTMM) has failed to start on my Mac Mini at home, although it worked fine on my MacBook Pro from the same network. After trying many many different things and following a number of hints, I remembered reading that BTMM uses IPsec. IPsec tunnels require endpoints to have their clocks synced, or at least to be set to times that are relatively close to one another.
I noticed the time on my Mac Mini differed from that of my MacBook Pro by about 10 minutes, and was failing to update its local time via time.apple.com (on the Date & Time tab of the Date & Time System Preferences panel). I switched it to time.asia.apple.com, the clock updated, and BTMM connected immediately after I clicked Start in the Mobile Me System Preferences panel.
See the comments for some recommendations on which time servers to use...
