I am not by any means a guru with Citrix Xen App so as this was passed onto me, hopefully it will help some of you. I set up Citrix with Web interface. The web interface worked internally but not externally (using a NAT rule on the firewall). They get the log in screen and can see the app’s but opening any yields the error message “There is no Citrix XenApp server configured on the specified address.
Two step process to fix this. The first is using the altaddr command.
Syntax is “altaddr /server: *citrix server name* /set *internal ip* *external ip*
From there all you have to do is go into the citrix access management console, and configure the client access managment section. Go into the DMZ settings and change the default connection to “Alternate” and add each direct connection needed.