Try <sessionState mode="InProc" cookieless="false" timeout="20" />
for ref remove AspxAutoDetectCookieSupport
or use this in web config,
<authentication mode="Forms">
<forms cookieless="UseCookies"/>
</authentication>
Browsing through this issue i found in one article
You could change your setting from
cookieless="AutoDetect"
to
cookieless="UseCookies"
. This will get
rid of it, but users without cookies
won't be able to pass session objects
around. Depending on how you are using
sessions, this may or may not matter.
You could also write a routine that
sniffs search robots and rewrite the
Url, or write .browser files for the
search engines you are concerned
about.
For ref: Remove cookie support
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