Access Denied!!! (Provider T-Online Germany)

ERROR
The requested URL could not be retrieved

While trying to retrieve the URL: http://secondlife.com/app/login/

The following error was encountered:

* Access Denied.

Access control configuration prevents your request from being allowed at this time. Please contact your service provider if you feel this is incorrect.

Your cache administrator is webmaster.
Generated Sat, 28 Jul 2007 16:35:59 GMT by web1.lindenlab.com (squid/2.6.STABLE12)

There are already several threads on that- why don't you try "search" or even check the first ten new posts????