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POIsPostBack is false when transfering to different server in server farm?
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copied!<p>I have a asp.net website that is deployed on two servers. In front of the servers there's a load balancer that distribute requests to the two servers. To store the session we use SQL Server. My problem is that if the user go to the page, press a button and then by the load balancer happens to be routed to the other server that request wont be recognized as a postback? Why is that, shouldn't it work just fine even with postbacks as long as the servers share the same machine keys?</p> <p>Details:</p> <ol> <li><p>Both servers have the same machine key configured, and I verified that the actual session is the same on both servers by a small debug page I made that sets and prints out a session object.</p></li> <li><p>To further verify the keys and Id I printed out the values of <code>HttpRuntime.AppDomainAppId</code> and a hashed machinekey <code>(MachineKeySection)ConfigurationManager.GetSection("system.web/machineKey")</code> and the sessionId <code>Session.SessionID</code> and got the same output on both servers. I used <a href="http://pardini.net/blog/2011/02/17/the-ultimate-asp-net-session-state-debugging-tool/" rel="nofollow noreferrer">Session Debug page</a> as a base for this. Its output looks something like this (I replaced my actual machinkey hash and session id with dummy values):</p> <pre><code>Current DataTime: 2012-07-20 10:52:58 Current Session Mode: SQLServer HttpRuntime.AppDomainAppId: /LM/W3SVC/5/ROOT Hashed with the MachineKey: HjtOPW5dfoihdlkd+SdsfkEWfs0= Local Machine Name: 127.0.0.1 Current Session ID: 2alsudhsdkjlhcmnsdfkhsdf </code></pre></li> <li><p>The ID for the site, found in IISMgr under Advanced Settings on the site is the same on all servers.</p></li> <li><p>As long as I stay on the same server everything works as expected.</p></li> <li><p>When I run the page locally (first request to web farm, then route second button click to localhost by fiddler), I get the same behaviour</p></li> <li><p>Stepping through the code and reading up on the <code>IsPostBack</code> property it seems my problem is that <code>this._fPageLayoutChanged</code> on the Page is true. However, if I understand things correctly it should be false when a postback happens? <a href="https://stackoverflow.com/questions/5650580/how-does-ispostback-technically-work">SO Question on its implementation</a></p></li> <li><p>Both servers run IIS 7.</p></li> <li><p>Both servers run Windows Server Web with SP2 and the same windows update updates installed. My local dev machine on the other hand runs Windows 7. </p></li> </ol>

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