grrr I spent nearly 3 hours just to debug the Forms Authentication problem. Finally find out its becoz of the Atlas update panel. I had UserLogin User Control, and this control resides inside the Master page Atals Update Panel control. After sign in, it doesn't go to the return url and it's showing Request.IsAuthenticate false. I was wondering what was the problem until I remove the update panel from the control. Then everythings works fine. So what I found out that FormsAuthentication.RedirectFromLoginPage("",false) doesn't work inside the atlas update panel. Still not sure though whether its common or its just me created the problem....
If you get this message while trying to consume a web service in your asp.net application, probably its becoz of your server is behind the firewall. So you try this out in your web config file.
<configuration>
<system.net>
<defaultProxy>
<proxy
usesystemdefault = "false"
proxyaddress="http://address:port"
bypassonlocal="false"
/>
</defaultProxy>
</system.net>
<system.web>