Remote Desktop Can Not find Client computer

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.
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

David AtkinTechnical DirectorCommented:

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.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
TwirpAuthor Commented:
  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…
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.