One item to note is that ICA Only mode set on the Gateway virtual server, as this can be one of two modes. ICA Only - When set to ON, it implies Basic mode where the user can log on using either Citrix Receiver or a browser and get access to the published apps etc. ICA Only - When set to OFF, it implies Smart Access mode where the user can log on using either Citrix Receiver or a browser or a Citrix Gateway Plug-in (aka VPN or Clientless Access). Depending on which option is required, you may want to check how many concurrent users you're going to have as option 1 is unlimited (dependant on appliance capabilities) whereby option 2 has a license count depending on edition (1,000 for Advanced Edition or Unlimited for Premium, again dependant on appliance capabilities).
