Remote Desktop does not accept my credentials

I am setting up three Win 7  PCs to allow remote Desktop to them.

Two work perfectly, one keeps saying "The username or password is incorrect". I have tried turning the firewall off but that isn't the problem.

Any ideas? I have tried "mypcname:portno", "lanip:portno" and "wanip:portno".

Thanks for any help.
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First, the firewall has nothing to do with user-id/passwords.

Are these in a Active Directory domain?  If not, then did you add your user-id/password to the 3rd PC.  Meaning, can you logon to that PC directly using the same user-id/password you are attempting to RDP with?
bill2013Author Commented:
I found the problem. The actual username was not the real username and had been changed.

Once this was tried everything was fine.

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