For Citrix StoreFront and Delivery Controller communication, you need to specify XML service broker communication to travel over HTTPS or HTTP and specify a port such as 80 or 443. The XML service is used for application and desktop resource enumeration including handling user name and password data from StoreFront to DDCs.
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xendesktop
Allow users to change password via Receiver for Web
With the default installation of XenApp/Desktop 7.5+ by default, users cannot change their own passwords via Receiver for Web.
The StoreFront console provides an administrator with three options for managing passwords;
1. Never (enabled by default)
2. When expired (users will only be prompted when their password has expired)
3. At any time (users can freely change their password at any time)