By default, only HTTPS is allowed.

To enable, create the following reg keys, depending on your OS architecture:

#32-bit OS config

HKLM\SOFTWARE\Citrix\AuthManager Type: String value (reg_sz) name:ConnectionSecurityMode value: Any

HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\Dazzle Type: String value (reg_sz) name: AllowAddStore Value: A

#64-bit OS config

HKLM\SOFTWARE\Wow6432Node\Citrix\AuthManager Type: String value (reg_sz) name:ConnectionSecurityMode value: Any

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Citrix\Dazzle Type: String value (reg_sz) name: AllowAddStore Value: A