HTTP 500 Error in ASP , while fetching more 5000 records from sql DB

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IIS6

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Hi,

I am working in ASP project. While getting more data from DB using ASP , getting error HTTP 500 error. Below lines are used in ASP page

Server.ScriptTimeout = 90
Response.Buffer = False
Response.AddHeader "Content-Length", 70000000
'Option Explicit
Response.Expires = -1000
Response.ContentType = "text/xml"

Sql data are converting to xml , in IIS 6 - windows server 2003 working fine . In IIS7 windows server 2008 , User session out happening , every second asking login credentials.

Commented line Response.AddHeader "Content-Length", 70000000 , pages able to load , but while fetching huge data more than 5000 records getting error.
Please let me know what i need to change.

Thanks
Suresh