How can I share session among subdomains in ASP.NET Core?
问题 I have a website which has subdomains such as ali.sarahah.com but if a user logs in from www.sarahah.com then goes to ali.sarahah.com the session is not saved. After searching I added the following in Startup.cs : app.UseCookieAuthentication(new CookieAuthenticationOptions { CookieDomain = ".sarahah.com" }); I found out that .AspNetCore.Identity.Application cookie domain is still showing the subdomain and not the the domain and that session problem is still there. Am I doing something wrong?