Probe Agent can not communicate with Citrix Gateway with port 5000

Error "Failed to authenticate Citrix Gateway credentials" raises if non 443 port is used in the FQDN of Citrix Gateway URL...

"Error: Not a privileged user” after Citrix Gateway authentication passed

After users input their username and password on the NetScaler Gateway login page, the URL redirects to the StoreFront SF URL. However, the application list fails to display, and an error message stating "Error: Not a privileged user" appears...