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ASP.NET Error: Not a valid Win32 FileTime.

Posted on 2011-09-22
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Last Modified: 2014-01-27
Experts,

I'm getting an intermittent error message on one of my sites, it appears to be happening when creating the Forms Authentication ticket, but I am not sure. The message is:

Not a valid Win32 FileTime.

Stack Trace:
at System.DateTime.ToFileTimeUtc() at System.Web.Security.FormsAuthentication.MakeTicketIntoBinaryBlob(FormsAuthenticationTicket ticket) at System.Web.Security.FormsAuthentication.Encrypt(FormsAuthenticationTicket ticket, Boolean hexEncodedTicket) at System.Web.Security.FormsAuthentication.Encrypt(FormsAuthenticationTicket ticket) at BasePage.LoginUser(sanSub thisSub, Boolean persist) in E:\0\2\98\59\2098059\user\2300711\htdocs\App_Code\BasePage.vb:line 315 at _Default.btnQuestSubmit_Click(Object sender, EventArgs e) in E:\0\2\98\59\2098059\user\2300711\htdocs\trial\Default.aspx.vb:line 96 at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Here is the function "LoginUser()", which creates the ticket and authenticates the user, where it appears to be originating, although it looks like the actual error is not triggered by one of my lines of code, but by something built into the forms authentication:

    Public Sub LoginUser(ByVal thisSub As sanSub, Optional ByVal persist As Boolean = True)
        FormsAuthentication.Initialize()
        CurrentSub = thisSub
        Dim Ticket As FormsAuthenticationTicket = New FormsAuthenticationTicket(1, thisSub.SubID, Now, thisSub.SubEnd.AddMonths(1), persist, "", FormsAuthentication.FormsCookiePath)
        Dim hash As String = FormsAuthentication.Encrypt(Ticket)
        Dim cookie As HttpCookie = New HttpCookie(FormsAuthentication.FormsCookieName, hash)

        If (Ticket.IsPersistent) Then
            cookie.Expires = Ticket.Expiration
        End If
        Response.Cookies.Add(cookie)
    End Sub

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This is for a subscription based newsletter, and the object "ThisSub" in the function represents a Subscriber object, and "SubEnd' is the date their subscription expires which is a valid date every time.

I have been using this function for years, and only in the last few months has this error started popping up.

Any insight would be greatly appreciated.
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Question by:Myles Cardiff
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LVL 83

Expert Comment

by:CodeCruiser
ID: 36582298
See if the discussion here helps to solve your problem.

http://www.codeproject.com/KB/aspnet/Forms_Auth_Internals.aspx
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LVL 1

Author Comment

by:Myles Cardiff
ID: 36582384
That explains how it is supposed to work, but not anything about why this would trigger a filetime error:

Each DateTime value is converted into the equivalent “FileTime” (represented as a long value) and converted to a byte array.

That's pretty much all it says. I'm passing a perfectly valid DateTime value to the ticket.
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LVL 83

Accepted Solution

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CodeCruiser earned 1000 total points
ID: 36582401
What is the regional setting on the server?
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LVL 1

Author Comment

by:Myles Cardiff
ID: 36582435
It's hosted by network solutions, so i don't really know. All I can tell is that it's U.S. East Coast timezone.
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