Hi Guus123,

From your description, you have an ASP.NET application that uses forms
authentication. It works well in dev env, but after deployed to server and
visisted through public DNS server address, the forms authenticcation no
longer work, correct?

Based on my experience, such problem behavior is possibly caused by the
authentication ticket(cookie based) is not correctly set to the domain your
client browser belong to.    

for ASP.NET forms authentication, if you choose to persist authentication
status, it will generate an authentication ticket and store it in cookie,
however, for cookie, it has a "domain" property indicate which domain it
belong. For your scenario, I think it is likely that the default domain
setting doesn't quite fit your environment. Here is a web article discuss
something on this issue:

#Forms Authentication Cookies and Subdomain Names
http://blog-howto.com/archive/2006/09/21/FormsAuthCookiesAndSubdomainNames.a
spx

You can have a look to see whether it helps some.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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