The Second Life grid is experiencing login and teleportation problems that apparently commenced sometime after 2am SLT. There's just enough detail in Chadrick Linden's post on the matter to point to routing problems between the two colocation facilities, citing that "During this time, a significant portion of the Second Life grid will not be able to be teleported to".That would be consistent with the two colocation facilities being unable to communicate directly with each-other, even though Second Lifers can communicate (mostly) with either. Under the 1.9 (and later) communications model, simulators need to be able to interconnect between themselves to allow teleportation. Sloppy or impeded interconnect can also lead to login and a wide variety of presence issues.
[Update: 3:55AM SLT, this issue is reported to be resolved]
