Remote Desktop Services with BigIP - Login Issue

Hi, need help with my RDS farm publish by BIG IP Waf on Azure.

 

I Have a farm running on 2012R2 with:

 

• 1 RD Gateway and RD Web Access
• 1 RD Connection Broker
• 1 RD Licensing
• 8 Session Host Server

This farm was running with a Fortinet firewall published environment using an external URL url.domain.com and it was working well. We are moving to Azure and when we moved the servers to azure and published it on BigIP, after that the external connection using the published URL are being stucked on "Initiating Remote Connection" and i cant see the connection on RD Gateway. By the local network its working fine.

 

I rollback the RD Gateway server to my on-premisses env(fortinet) and it back to work, now i need to find out what is wrong to go again to the azure.

 

Anyone can help?

 

I already check this document but it is for 2008 so i dont know if there is other document for 2012

 

https://linuxcluster.files.wordpress.com/2011/01/f5-microsoft-remote-desktop-services-dg2.pdf