How to secure the ASP.NET_SessionId cookie?

Question

I have set the .ASPXAUTH cookie to be https only but I am not sure how to effectively do the same with the ASP.NET_SessionId.

The entire site uses HTTPS so there is

Answer 1

Going with Marcel's solution above to secure Forms Authentication cookie you should also update "authentication" config element to use SSL

Other wise authentication cookie will not be https

See: http://msdn.microsoft.com/en-us/library/vstudio/1d3t3c61(v=vs.100).aspx