Mar 13, 2015 04:57 AM|jierong|LINK
From the error message, it's no auth issue.
Based on my understanding, ASP.NET_SessionId is not stored in cookie every time, you can refer to discussions on http://forums.asp.net/t/1490732.aspx for more details. So maybe ASP.NET_SessionId is not the
real issue here.
Are you connecting to a secure page of a HTTPS site? If so, you can take a look the following threads:
Hope above info is helpful to you.