Problem: Forms authentication appears setup correctly. When running the following lines, the application is redirected back to the the login page. No calls to other pages are made.
e.Authenticated = true;
FormsAuthentication.RedirectFromLoginPage(Login1.UserName, true);
Web.config
<system.web>
<authentication mode="Forms">
<forms name=".ASPXFORMSDEMO" loginUrl="login.aspx" protection="All" path="/" timeout="180" enableCrossAppRedirects="true" domain="xyz.com"/>
</authentication>
<authorization>
<deny users="?"/>
<allow users="*"/>
</authorization>
</system.web>
The problem was with the web.config. The test workstation where this was setup did not like the part...
domain="xyz.com"
Removing that made the entire thing work.