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C# Application, Cookies not set when we open application through iFrame tag

I have created one web application and when i run application in normal browser windows it works perfectly. But when i open same application in iFrame tag my cookies get vanished automatically.
When I Inspect browser window i can see the cookies and session but it won't work.
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This is probably because you have not set the domain on the web.config
Some times you call the iframe with out the www. on your domain, and this is set a different cookie than when you have the www.
so on web.config set the domain where its needed, eg:
<authentication mode="Forms">
<forms domain="local.com" />
</authentication>
<httpCookies domain="local.com" />

I have added below config in web.config file
<sessionState mode="InProc" timeout="500" cookieSameSite="None"/>
<httpCookies httpOnlyCookies="true" requireSSL="true" domain="local.com"/>
<authentication mode="Forms">
<forms loginUrl="~/Auth" timeout="500" slidingExpiration="true" domain="local.com"/>
</authentication>
But still cookies not set. Could you please assist?

asp net forms authentication cannot login on two application in same time on same server

I created two ASP.NET Web Forms Application in which I use separate Form authentication
with different machine keys .
But when I login in one of them I am logout in other.
Same thing happen on production server and on localhost.

If you haven't configured at least one of the two applications to use a non-default cookie name, they will both try to use the same cookie name ".ASPXAUTH", and if by "on the same server" you mean they are accessed using the same hostname, then logging into one will overwrite the cookie of the other.
Try overriding the cookie name in your Web.config, something like this:
<authentication mode="Forms">
<forms loginUrl="login.aspx" name=".FOOASPXAUTH" />
</authentication>
And in the other application:
<authentication mode="Forms">
<forms loginUrl="login.aspx" name=".BARASPXAUTH" />
</authentication>

website authorization behaving very unusually

I am using forms authentication in asp.net4. But the authorization is behaving very unusually.
Following is my web.config snippet-
<authentication mode="Forms">
<forms loginUrl="Login.aspx" timeout="2880" protection="All" path="/" />
</authentication>
<authorization>
<deny users="?"/>
<allow users="*"/>
</authorization>
When i try to open any web page i am redirected to Login page as expected. If close my browser i should be logged out, but thats not happening although i am setting persistentCookie=false as follow
FormsAuthentication.RedirectFromLoginPage(username, false);
Now after closing browser if a login again i am considered authenticated user, but if i clear cookie cache in my browser than i wont be considered authenticated user.
I am not setting cookie anywhere and i dont want persistent cookie, than why is this happening.
Please tell me if i am missing something.
Anobody know something related to this
I just found that this problem is only with Chrome 21.0, and not with Firefox 7.0 or Opera 11.4 (problem of authenticating even though session ends).

When you use authentication mode="Forms" your auth credentials stored in cookies by default. If you want to change this behaviour you can use cookieless="UseUri" attribute, than your credential will be stored in the URL. You can find more inforamtion forms Element for authentication.
timeout attribute specify how long cookies will be stored (in minutes) by default it is 30.

asp.net authentication looks at machine name

I built a web app a while back that is miss behaving out of the blue. Page.User.Identity.Name returns the machine name ie phil_toshiba/phil instead of the username i set when the user logs in through the log in form (should be an email address):
System.Web.Security.FormsAuthentication.RedirectFromLoginPage(tb_email.Text, true);
I dont know why it has only just started doing it but it doesn't do it on the live site just the local project i need to work with to update some features. the live and local are in sync (code is exactly the same) only difference is the live site is compiled and using iis.
EDIT this is the authentication tag in my web.config file:
<authentication mode="Forms" >
<forms loginUrl="Default.aspx" name=".ASPXFORMSAUTH" defaultUrl="Sections.aspx">
</forms>
</authentication>

Check your web.config, it should be set to use Forms authentication not Windows:
<system.web>
<authentication mode="Forms"/>
</system.web>

Get domain\user in a intranet using authentication mode = "forms"

I have to install a ASP.NET site in a intranet network.
I'm using a authentication mode=Forms".
In a my page i need to get the domain\user of the user connected.
I've followed this article:
http://support.microsoft.com/kb/306359
But it doesn't work.
My web.config has:
<identity impersonate="true"/>
<authentication mode="Forms" >
<forms name="login" loginUrl="~/Login.aspx" defaultUrl="~/Default.aspx" timeout="30000" />
</authentication>
<authorization>
<deny users = "?" />
<!-- This denies access to the Anonymous user -->
<allow users ="*" />
<!-- This allows access to all users -->
</authorization>
I'm using IIS 6 and .net 4
In Authentication methods settings of iis i've checked
-Enable anonymous access
-Integrated windows authentication
How can i do?
thanks

If you have anonymous access enabled the web-site visitors will all be impersonating the IUSR_MachineName account (or whatever you have configured as the anonymous account).
You need to disable anonymous access so the site will force the user to authenticate with his/her credentials so they will be available in your ASP.NET page. Otherwise the server has no idea who the current user is.