Remote Desktop Can Not find Client computer

hi..
Up until a week ago Our user could log in from home via our web portal. Now He can not.
This is the error he is getting.

Remote Desktop can’t find the computer xxxxxx. This might mean that xxxxxx.  does not belong to the specified network. Verify the computer name and domain that you are trying to connect to.

I can RDC into his work computer inside our network but not from the web portal as him.  I can RDC in from the web as me.
He has full Admin rights to his computer and he is in the remote group both by web access and VPN.

I renew his DNS, Rebooted all three computer involved. He home, His work and the Server.
I have turn off all virus protection and tried - made no different.
I find not error listed on all computer.
There has been no update during this time.

Were running SBS 2011
Watch guard XTM 3 firewall.
Panda Virus protections.
TwirpAsked:
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David AtkinTechnical DirectorCommented:
Hello,

Are you connecting from via the Remote Web Workplace of direct via RDP?

If its direct RDP then are you going via the VPN or external through port forwarding?

It sounds like either the machine can't resolve the computer name or that the computer name entered in the RDP properties is incorrect.
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TwirpAuthor Commented:
Hi
  Thanks for the Help… Sometime one over look the answer even when it staring us in the face. So I took the round about fix. Thanks again for you help.

The Fix the hard way. Remove the Client computer from the network and rejoined it.

The Fix the easy way. Just relog him in under the network. Etc: Client computer user name    CCCCCCC\user and it need to be Domain DDDDDDD\user.

Thanks again for your help…
Twirp
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