ASP.NET Core: Share a cookie between subdomains

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By default when you create a cookie in ASP.NET Core it is only applicable to that specific subdomain.

For example, a cookie created in subdomain.mydomain.com can not be shared with a second subdomain secondsubdomain.mydomain.com.

To change this behavior,  you need to add the following code in Startup.ConfigureServices:

	services.ConfigureApplicationCookie(options =>
	{
	options.Cookie.Domain = ".mydomain.com";
	});

view raw ConfigureCookie.cs hosted with ❤ by GitHub

By specifying a common domain in the Cookie.Domain property, the cookie will be shared between subdomain.mydomain.com and secondsubdomain.mydomain.com.