The syntax is finicky. Apparently the hostname must come last, any remaining 
parameters are not parsed. Have you tried the example below? This works 
successfully for me in a very similar environment.

$ xfreerdp -u username hostname.domain.tld


    -----Original Message-----
    From: Marcin Zajączkowski [mailto:msz...@wp.pl]
    Sent: Sunday, May 06, 2012 2:08 PM
    To: freerdp-devel@lists.sourceforge.net
    Subject: [Freerdp-devel] Authentication failure with Win2008 with
    current security updates (worked some time ago)
    
    Hi,
    
    A few months ago I was able to connect to Windows 2008 machine with
    FreeRDP 1.0.1. Recently I've tried again and got:
    
    > $ xfreerdp somehost -d mydomain -u username connected to somehost:3389
    > Password:
    > SSL_read: Failure in SSL library (protocol error?) Authentication
    > failure, check credentials.
    > If credentials are valid, the NTLMSSP implementation may be to blame.
    
    I'm not an administrator of that system. I know the system is "Win2008
    r2 64bit sp1" and there were installed some security fix related to rdp
    in the meantime (which could be a reason?).
    
    I tried with --no-nla, --ntlm, --sec (rdp, tls or nla) - with no result.
    
    I have found some reports with the same error message, but none of the
    mentioned solutions helped. Is it a know problem with current Windows
    2008? I can provide some more detailed information if needed.
    
    Regards
    Marcin
    
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Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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