You should remove your Demo CA's self-signed certificate from your Web browser, both to avoid confusion in real use of your browser, and to enable this tutorial to be run again if required. 
	 
 
	 Note: These steps are applicable if you are using Internet Explorer (version 9); steps required for other versions of Internet Explorer or other browsers may differ. 
	 
 
	  
		- In Internet Explorer, click 
		  Tools > 
		   Internet Options > 
		  Content > 
		  Certificates. 
		
 
		- Click the 
		  Trusted Root Certification Authorities tab, locate your Demo CA's certificate (the Common Name, not the organization name), then remove it. 
		
 
 
		- Close the browser and re-open it.