we have Citrix PS 4.5. in one of our office. office2 connect to it via WAN wiht PN Agent 10.150. office3 have not problem at all, and connect same way. See pictures below.
Also this error only happens when i entered the Citrix server name (host name) on the SERVER URL on office2 clients machines. However, when i entered the IP of the citrix server it pop ups agent for users credential on client machines.
we have not made any changes on WAN Routers.
any though is greatly appreciate.