Request Validation with WSS Cookies

[Anbu]

All,

I'm hosting a web site on Windows 2003 server as default web site. Same
server is also hosting Windows SharePoint Server 2003 on another port.

When I access WSS site, it works fine. But while accessing the default
site from the same browser or without deleting the cookies, it throws
the following message.

Description: Request Validation has detected a potentially dangerous
client input value, and processing of the request has been aborted.
This value may indicate an attempt to compromise the security of your
application, such as a cross-site scripting attack. You can disable
request validation by setting validateRequest=false in the Page
directive or in the configuration section. However, it is strongly
recommended that your application explicitly check all inputs in this
case.

Exception Details: System.Web.HttpRequestValidationException: A
potentially dangerous Request.Cookies value was detected from the
client
(Microsoft.Sharepoint.AcceptHeaders="...&pps=TRUE& one=FALSE&mpp=FALSE").

I cannot restrict Sharepoint from using Cookies for it's own purposes.
Meanwhile I need to store few things like user authentication etc in
the cookies. Whenever I access the default site, after access the
sharepoint site, it generates the error.

How can I avoid?

TIA.