401 - unauthorized error while connecting to web service -Sharepoint 2010

hi,

i am calling webservice which is installed in sharepoint from custom pages.

my server is not load balanced

but i got error like 401 unauthourized.

I set dword value to 1 for loopback issue

still i got the same error

i also used default credentials true;

requestHTML = myClient.DownloadData(fileUrl);

this line take too much time results in 401 error.

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Thanks Manohara R