Error: "403 - Forbidden: Access is Denied" After Log on to NetScaler Gateway

Post external log on to Netscaler Gateway you receive a server error with the following text: Error: "403 - Forbidden: Access is Denied" After Log on to NetScaler Gateway...

Attach a smart card reader and insert your smart card to log on

Failed to add store site on Citrix receiver with error "Attach a smart card reader and insert your smart card to log on". The customer did not enable smart card authentication method...