[squid-users] edit default page

ERROR
The requested URL could not be retrieved

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While trying to retrieve the URL:
http://r.web.de/f/freemail/head/t/suche/profi/u/c3VjaGUud2ViLmRlL3NlYXJjaC8$Zm9ybT1lcnc_/c/P$eSn4eUwuUM
The following error was encountered:
  a.. 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.
where is this page alocated, and you like to edit this default page....
Thanks