If the STA status is showing as down"Down", check your STA server (. This is the same server as your delivery controller ) is up.
Also check the Manage Citrix Gateway, on your Storefront GUI is configured correctly.
Check the Gateway FQDN is correct,
Make sure the URL for the STA server is also correct.:
And make sure
Ensure you have correctly specified DNS Name server correctly on the ADC:
Page History
Overview
Content Tools