MAC RDC connection problem

Did you install and activate a terminal server licensing server in your domain ?

Here is a link for more details.
http://technet.microsoft.com/en-us/library/cc754309%28v=ws.10%29.aspx

@s3e3 Yes, MS licensing is set up and active. All MS clients connect without an issue.

@strung. Thanks, let me look those over. I'm not against using a third party client but this is an issue that I've found, while researching on the web, affects Server 2008 R2 and now 2012. Would prefer to solve it using the native client if possible, However I'm also a realist and know trying to get the two behemoths (MS and Apple) to move may be impossible.

Actually many people who have tried both prefer CoRD.

The link you gave me I had been looking at before, I just ran into search fatigue last night and didn't get to the bottom of the thread. "Network Touch" had a link to a V2.1.2 RDC client. I'm going to install it and test it. If it solves the problem great, if not we'll punt and go to one of the 3rd party apps. I'll let you know. Thanks.

Just be aware of the fact that the v. 2.1.2 that you are downloading does not seem to be an official MS release. It is not available on their website.

I noticed that, but "Network Support" said  "This is direct from Microsoft support.  I hope Microsoft does not get mad at me for posting this.  After all, this will be released in a near future update." so I'm hopeful. And it appears to have solved the issue for some others. Apparently since he posted that last September and it's now been over 6 months MS "near future" updates are different that what perhaps you and I categorize as "near future".

And no joy on the 2.1.2 version so coRD it is. Thanks strung.

Thanks for your follow ups on the issue. He's up and running and as happy as an Apple user can be running MS products.