Cannot Connect to any RDP server but can telnet to port. Tech Support

Cannot Connect to any RDP server but can telnet to port.

I have a client site that is having issues connecting to any server using RDP.
i have tested from 2 computers within their office trying to connect to 3 different external server running terminal services. 

All of them are failing.
I can telnet to each one on port 3389 but when trying to connect with RDC it fails at configuring remote connection.
i have checked the firewall and all outbound connections are allowed.
i am able to connect to each server from
my office.
i have also disabled the firewall locally on the computers. 

does any one have any ideas on where i can see it being blocked?

i have a webserver behind the same firewall and can access that without any issues.

Solutions to the Problem Cannot Connect to any RDP server but can telnet to port.

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