Safari GMail ViewState problem

I have an application which sends out email to subscriber and users can click on the link within email to get into the web application. I am facing a weird problem that if a user clicks the link to my app from GMail (Mac/Safari), it doesn’t work from second page onwards. It works if you cut and paste URL in Safari window. All other combination works: Mac/Firefox/Gmail, Mac/Safari/Hotmail, Windows OS all combinations. I realized that in the case where it is failing, Safari is sending out stale viewstate (one from the very first page), so on second page even though it got a new viewstate, while submitting it sends out stale viewstate and definitely the server throws error. Try creating the 3 web pages as shown below and then send an email to some gmail account with link to any of these pages. (e.g. www.mysite.com/safariissue/webpage1.aspx ). On submitting the second page WebForm2.aspx, Safari sends out viewstate of WebForm1.aspx. Any help to resolve the issue is appreciated.
Error:
===============================================================================
==============================================================================
Unable to validate data.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Web.HttpException: Unable to validate data.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +193
System.Web.UI.LosFormatter.Deserialize(String input) +60
[HttpException (0x80004005): Authentication of viewstate failed. 1) If this is a cluster, edit <machineKey> configuration so all servers use the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. 2) Viewstate can only be posted back to the same page. 3) The viewstate for this page might be corrupted.]
System.Web.UI.LosFormatter.Deserialize(String input) +116
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +101
[HttpException (0x80004005): Invalid_Viewstate
Client IP: 15.80.89.148
Port: 50821
User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en)
AppleWebKit/418.9 (KHTML, like Gecko) Safari/419.3
ViewState: dDw1OTQ1ODc1NTc7Oz63T1oWJQyGZ7EXIFtw5wB8D9ZRUA==
Http-Referer: http://www.mysite.com/Safariissue/WebForm2.aspx
Path: /Safariissue/WebForm2.aspx.]
System.Web.UI.Page.LoadPageStateFromPersistenceMedium() +446
System.Web.UI.Page.LoadPageViewState() +18
System.Web.UI.Page.ProcessRequestMain() +438
Version Information: Microsoft .NET Framework Version:1.1.4322.2032; ASP.NET Version:1.1.4322.2032
=============================================================================
Source Code:
================================================================================ ===
WebForm1.aspx
<%@ Page language="c#" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<script runat="server">
void ButtonNextClickHandler(object sender, System.EventArgs e)
Response.Redirect("WebForm2.aspx");
</script>
<html>
<body>
<form id="Form1" method="post" runat="server">
<asp:label id="lblLabel" runat="server">Page 1 </asp:label>
<asp:Button id="btnButton" runat="server" OnClick="ButtonNextClickHandler" Text="Next"> </asp:Button>
</form>
</body>
</html>
WebForm2.aspx
<%@ Page language="c#" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<script runat="server">
void ButtonNextClickHandler(object sender, System.EventArgs e)
Response.Redirect("WebForm3.aspx");
</script>
<html>
<body>
<form id="Form1" method="post" runat="server">
<asp:label id="lblLabel2" runat="server">Page 2 </asp:label>
<asp:Button id="btnButton2" runat="server" OnClick="ButtonNextClickHandler" Text="Next"> </asp:Button>
</form>
</body>
</html>
WebForm3.aspx
<%@ Page language="c#" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<script runat="server">
void ButtonNextClickHandler(object sender, System.EventArgs e)
Response.Redirect("WebForm1.aspx");
</script>
<html>
<body>
<form id="Form1" method="post" runat="server">
<asp:label id="lblLabel3" runat="server">Page 3 </asp:label>
<asp:Button id="btnButton3" runat="server" OnClick="ButtonNextClickHandler" Text="Next"> </asp:Button>
</form>
</body>
</html>

Well, I just Reset Safari and that seemed to do the trick. Thanks for the lead!
Dave

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