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. 
	 
 
	  
		- In your browser, go to the options where you manage certificates. 
		  
 
			 - Internet Explorer, click 
				Tools > 
				 Internet Options > 
				Content > 
				Certificates. Then go to the 
				Trusted Root Certification Authorities tab.
			 
 
 
			 - In Mozilla Firefox, click 
				Tools > 
				 Options > 
				Advanced. Then scroll down and click 
				Manage Certificates and click 
				Authorities.
			 
 
 
		  
		 
 
		- Select your Demo CA's certificate (the Common Name, not the organization name), then remove it. 
		
 
 
		- Close the browser and re-open it.