ASP.NET Session Cookies – specifying the base domain

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Create a ISessionIDManager, since you only want to change the cookie domain we will let the default one do all the work.

This is configured in web.config on the sessionState element under <system.web>.

<sessionState sessionIDManagerType="MySessionIDManager" />

And the implementation.

public class MySessionIDManager: SessionIDManager, ISessionIDManager
{   
    void ISessionIDManager.SaveSessionID( HttpContext context, string id, out bool redirected, out bool cookieAdded )
    {
        base.SaveSessionID( context, id, out redirected, out cookieAdded );

        if (cookieAdded) {
            var name = "ASP.NET_SessionId";
            var cookie = context.Response.Cookies[ name ];
            cookie.Domain = "example.com";
        }
    }
}

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