__dopostback undefined in IE 11 on windows preview 8.1

Question

I have an ASP.net 4.0 application running on Windows Server 2003.

I am running Windows 8.1 preview with IE 11 and I am getting the

Answer 1

We are currently using asp.net 4.0 and had this issue for a while. It first appeared with IPad users, and we solved it by creating a IPad.browser file. Then this bug appeared for IE11 users. We installed the KBs above with no luck. The solution: delete all *.browser files (and even the App_Browsers folder itself). Now it works!

Answer 2

I think this is fixed by this KB http://support.microsoft.com/kb/2836939/en-us

More details (for older OS's and .NET versions)

KBs for the IE11 GDR:

• 2836939 .NET 4 - Win7SP1/Win2K3SP2/Win2K8R2SP1/Win2K8SP2/VistaSP2/WinXPSP3
• 2836940 .NET 3.5 SP1 - Win2K3SP2/Win2K8SP2/VistaSP2/WinXPSP3
• 2836941 .NET 2.0 SP2 - Win2K3SP2/WinXPSP3
• 2836942 .NET 3.5 SP1 - Win7SP1/Win2K8R2SP1
• 2836943 .NET 2.0 SP2 - Win7SP1/Win2K8R2SP1
• 2836945 .NET 2.0 SP2 - Win2K8SP2/VistaSP2
• 2836946 .NET 2.0 SP2 - Win8RTM/WinRTRTM/Win2K12RTM
• 2836947 .NET 3.5 SP1 - Win8RTM/WinRTRTM/Win2K12RTM

Answer 3

I tried every patch that I've seen listed on the internet, including the ones listed here. The only thing that actually seemed to work was installing the .NET 4.5 Framework on the server.

Get it here: http://www.microsoft.com/en-us/download/details.aspx?id=30653

Hope this saves someone a few of the hours I've lost on this one.