Were you aware that Linden Lab maintains a Sansar status page? This is the first best place to look for information on those rare occasions when you cannot get in-world. For example, this is the message you get right now as LL works on updating the software:
Click the red button in the upper-right-hand corner of the Sansar status page to enter an email address to be notified when Linden Lab creates or updates an incident report. (You’ll have to verify that email address by clicking on a special link in an email they will send you.)