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Load balance session hosts from external rdweb connections - not balancing

I have been unable to get the below system to load balance from external links. It works fine internally.

Users connect via Rdweb and then RDP to a TS Farm which lists the GW Server.
A Godaddy cert handles security.
3 Session hosts are balanced using DNS round robin on the internal Domain controller.
The one session host is also the TS Broker being TS5
When users connect from external sources they only ever connect to TS5
All the settings and policies appear correct but it is not load balancing from external connection.

Session hosts are all set in Remote app sources and local session host groups.

All these servers are virtualized.

If I RDP directly to the remote address, it connects me to the Gateway server.

Any suggestions on this issue would be appreciated.
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Aaron TomoskyDirector, SD-WAN Solutions

Commented:
Heres a theory:
when you are internal, it's bypassing the gateway by default
https://technet.microsoft.com/en-us/library/cc772479.aspx

when you are external it's always using the gateway, so I'm definitely thinking the gateway is setup incorrectly for the load balance.

I'm not super familier with 2008r2 TS Farms so I don't know how much help I can be going forward, but here are the basics
https://technet.microsoft.com/en-us/library/cc772418%28v=ws.10%29.aspx

Author

Commented:
Thank you for the input Aaron, I will check these links.
I do suspect it is a gateway config issue.
Looks like the issue was related to permissions of the 2nd TS server in the farm as well as DNS round robin.
Seth SimmonsSr. Systems Administrator

Commented:
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.