web.config forms authentication, cookiename - asp.net

Question

I have a web.config with the following:
<system.web>
<customErrors mode="Off"/>
<authentication mode="Forms">
<forms loginUrl="Login.aspx" name="SIPE_ASPXAUTH">
<credentials passwordFormat="Clear">
<user name="user1" password="123456"/>
<user name="user2" password="123456"/>
<user name="user3" password="123456"/>
</credentials>
</forms>
</authentication>
<authorization>
<deny users="?"/>
</authorization>
<compilation debug="true"/>
This web.config always redirects me to the following url
http://localhost:53077/Login.aspx?ReturnUrl=%2fDefault.aspx
My start page is a Login.aspx and even after entering the correct credentails, it redirects me to the above url.
So here's what I did.
I took out the name property in the
<forms loginUrl="Login.aspx">
and left everything else untouched.
It works perfectly.
Can anyone pls explain why.
I understand that this is a cookiename and the default is ASPXAUTH. This cookie is used to authenticate a user. Also it is stored in tools..options...
What is the use of setting this cookiename. Is it to allow cross browser functinality.n
How would I make this to work by having the name property in the <forms loginUrl="Login.aspx">
Thank u

Answer 1

config setting is seems to be OK but you have write some code in your login page's code behainsd also for form authentication. After checking user name & password is corrent you have to write below code :
FormsAuthentication.SetAuthCookie(
this.TextBox_username.Text.Trim(), flase);
FormsAuthenticationTicket ticket1 =
new FormsAuthenticationTicket(
1, // version
this.TextBox_username.Text.Trim(), // get username from the form
DateTime.Now, // issue time is now
DateTime.Now.AddMinutes(10), // expires in 10 minutes
false, // cookie is not persistent
"HR" // role assignment is stored
// in userData
);
HttpCookie cookie1 = new HttpCookie(
FormsAuthentication.FormsCookieName,
FormsAuthentication.Encrypt(ticket1) );
Response.Cookies.Add(cookie1);
For more detail on Form Authentication Click Here