User ID	 	Capabilities	 	Contact Info
anonymous	   	ghmncz	   	Anon
blackdog	   	gv	   	blackdog

but

 fossil clone http://blackdog@xx.yy.zz.dd:8080/ test
                Bytes      Cards  Artifacts     Deltas
Send:              49          1          0          0
Received:         120          2          0          0
Send:             625         25          0          0
password for blackdog: 
Error: login failed

benoit added on 2010-07-18 07:17:52:
You should use http://blackdog:password@server:8080

drh added on 2010-07-25 21:00:09:
I just tried this and it works fine for me. Please verify that both the client and the server have the most recent version of Fossil installed. If that does not clear the problem, the please reopen the ticket providing additional information on how to reproduce the problem.