Why does my SL suddenly wont let me log in with the error " Unable to connect to the grid . " ?

[konstantinos Zwickel]

ive tried changing location , Restart rooter , my laptop everything , wtf ? ...

[Rolig Loon]

You've done the easy, obvious things.  Those usually work.  Since they didn't, here's a set of other possibilties (written for Firestorm users, but applicable to any of the viewers):

 

• Buildup of Open Notifications It is possible for a buildup of too many notifications to cause Firestorm to disconnect during or shortly after login. If you experience such disconnections repeatedly on Firestorm, then follow the instructions under “Firestorm Logs Out During Login” here.

• Domain Name Server (DNS) Issues Users of Firestorm may get “Unable to connect to simulator”, or a message specifically saying that there are issues with the DNS. In that case refer to this page for how to proceed.

• Group Tag Preventing Login There are cases when your active group tag will prevent log in - most usually when the tag contains unicode characters (though there have been isolated cases where even standard Latin characters have prevented log in as well). If this happens, you can attempt to log in using a text based viewer such as Radegast or MetaBolt, and change your active group in that viewer (preferably to None), log out and then log in with your usual viewer.
  Should that not be an option, you will need to find a way to get word in-world, to the group owner, and have them either edit the group title tag or, should that not be an option, eject you from the group.
  If that too is not a viable option, then the only other recourse is to file a support ticket with LL and have them change your active group.
  This is a server issue, and is reported in this LL JIRA.

[valerie Inshan]

Weekly rolling restart. Whatch the grid status on your dahboard.

http://status.secondlifegrid.net/2012/11/07/post1817/

You can also try logging in from another location.