From: Scottrm on 30 Jun 2010 07:04 We are observing some strange behaviour in our web server logs where where the Identity of the currently logged in user seems to be getting swapped with another user. I will describe our set up before explaining further. We are running an asp.net web site (v3.5 of the framework) on 2 Windows 2008 web servers and use forms authentication.They are load balanced using a separate server running Apache 2.2 on Linux (Cent OS 5). The load balancing simply attaches a cookie to a user and directs them to a particular server for each subsequent request. We notice on occasion patterns in the log like this (details obfuscated) First Log Entry UserName - customer1(a)x.com UserId - 1111 WebPage - page1 IP - ip1 Time - 2010-06-29 12:56:20.750 SessionId - h3uyz2fsdfegugjy452sdz0far Second Log Entry UserName - customer1(a)x.com UserId - 2222 WebPage - page2 IP - ip2 Time - 2010-06-29 12:57:16.133 SessionId - 21ipjsdfsdfieqqwyfdokgqsb55 We are using forms authentication using the standard asp.net forms authentication framework (the standard login control and we implemented a custom membership provider). The UserName is the Windows identity retrieved using "HttpContext.Current.User.Identity.Name" The UserId is the database Id set in the session. The sessionId is retrieved using "HttpContext.Current.Session.SessionID" As you can see the same Windows identity is the same for 2 different users, under different IP addresses and with different session id's, hitting the site about the same time. We checked and the IP's were from totally different locations. The wrong windows identity seems to be getting recorded. UserId 2222 should have a different username recorded. Since it happens very occasionally, the code is standard and has not changed substantially for some time we don't "think" it is a coding error. We presume either a problem with the load balancer or some problem in the web server. I have never heard of such problems in asp.net before. Recently we did change our set up from IIS6 on Windows 2003 and a Cisco hardware load balancer to the current setup of IIS7 on Windows 2008 and the Apache load balancing. Any ideas appreciated. The forms authentication entry in the web.config is authentication mode="Forms" forms loginUrl="LoginPage.aspx" name=".ASPXFORMSAUTH"
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