RDS server configuration

We have installed the RDS server in a windows server 2008 R2 with 5 roles as mentioned below
Remote Desktop Connection Broker
Remote Desktop Gateway
Remote Desktop Licensing
Remote Desktop Session Host
Remote Desktop Web Access

We have configured port forwarding in a gateway level device.
External and internal URL of RDS
Internal URL is going to be http://MP-rds.abc.com
External URL is going to be http://rds.abc.com 
currently for testing we’re using http://remote2.abc.com)

Connecting internally works perfectly but connecting externally we receive the following error when attempting to launch an app: "The remote computer could not be found".

Kindly suggest...!!!
Who is Participating?
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.

Cliff GaliherCommented:
Could be DNS. Or port forwarding is not working as expected. I'd start with a simple nslookup test. Then firewall/router logs. And if necessary, capture network traffic with netmon on the destination server and view it in wireshark. In that order.

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
rigelnetAuthor Commented:
Now we can able to access app and host computers both internally and externally which are configure in RDS server

we are able to connect exteranally from windows 8 operation system but we can not able to access remote app from windows 7 and windows XP.
Is there any security patch update issue? while connection from windows 7 and xp. because its working fine while connection from windows 8 operation system.

we are able to login in web using external url but we could not connect to remote app.

Furthermore we need to add more computers which can be access via web externally.
kindly provide step by step guide.
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
Remote Access

From novice to tech pro — start learning today.