Good question! While there may be a way to find this out from the Citrix logs - looking at this through the lens of NetScaler only - I would use HDX Insights on ADM which will provide me with a minimum of the IP address of the connection. This can be viewed in real time with the connection open. More info here: https://docs.netscaler.com/en-us/citrix-application-delivery-management-service/analytics/hdx-insight Best Regards, Ronan.
We recommend that you use NetScaler ADM side by side with your NetScaler - and it will help you from an operational and support perspective. Authentication issues can be reviewed in the Gateway Insight and/Or HDX Insight dashboard. https://docs.netscaler.com/en-us/citrix-application-delivery-management-service/analytics/gateway-insight
Ronan OBrien's post in how do we find out server name associated with published application was marked as the answer