iis7 integrated mode asp.net 4.0 forms authentication problem using IE8

Question

Anyone experience any issues with IIS7, integrated mode forms authentication while using IE8? I have a website with a login form, once logged in, any postback causes the user to be logged out. This doesn't even happen consistently, sometimes I can login and not experience this issue, other times it happens instantly. I can not replicate the problem in any other browser and I cannot replicate on my development machine running / debugging vs2010.

Answer 1

Is your application on a server farm? If so, ensure your web.config's have matching machine keys - http://msdn.microsoft.com/en-us/library/w8h3skw9(v=VS.100).aspx