[i've do this thing i can log on the web site but in my loggin continue to give me this error : Unabl]

i've do this thing i can log on the web site but in my loggin continue to give me this error : Unable to connect to the grid.
DNS could not resolve the host name.
Please verify that you can connect to the http://www.secondlife.com web site. If
you can, but continue to receive this error, please go to the support
section and report this problem.

what can i do please?