Form authentication (form authentication) issues

Objective

Recently, there have been some problems in making forms authentication in ASP.

Problem

When a form is certified, the ticket is decrypted from the cookie value in the postauthenticaterequest event. As follows:

        protected void application_postauthenticaterequest (Object sender, EventArgs e)        {            var authcookie = Request.cookies[formsauthentication.formscookiename];             if NULL )            {                var authticket = formsauthentication.decrypt (authcookie.value);                TODO ...             }        

There was no problem yesterday, but the following results were unexpectedly run again today:

This problem has never been met, only to resort to StackOverflow.

The final discovery requires the authentication method to be added to the configuration file:

   <authentication mode="Forms">         </authentication>

Resolve the issue as set up above.

Summarize

The above encryption and decryption Formsauthentication.encrypt and Decrypt are also related to machine key , as the above unresolved can be resolved by setting machine key.

Reference URL:

FormsAuthentication Unable to validate data

Configure MachineKey

Form authentication (form authentication) issues