Doesn't it fail more gracefully than that?  If you don't import the certificate, the browser doesn't accept the single pixel and displays a broken icon, after a time.  So slower and uglier, but you don't get a browser warning.
e.g.:
	
	
	
		
				
			e.g.:
		Code:
	
	Shutdown by clients after ServerHello
A client initiates a handshake, receives a response from server and then shuts down the connection unilaterally. The most likely reason is a client finds out the certificate in the server's response not matching its hard-coded fingerprint. Instead of notifying the server of unknown cert or CA, the client shuts down the connection silently. It's considered suspicious client activity worth more attention.
	
			
				Last edited: 
			
		
	
								
								
									
	
		
			
		
	
								
							
							
	