Add error message to a TSG

Author: Clare-Zheng82

articles/data-factory/security-and-access-control-troubleshoot-guide.md

@@ -7,7 +7,7 @@ ms.service: data-factory
 ms.subservice: integration-runtime
 ms.custom: synapse
 ms.topic: troubleshooting
-ms.date: 12/15/2021
+ms.date: 02/07/2022
 ms.author: lle
 ---
 
@@ -61,7 +61,7 @@ If none of the preceding methods works, contact Microsoft for help.
 
 #### Symptoms
 
-After you disable public network access for the service, the self-hosted integration runtime throws the following error: “The Authentication key is invalid or empty.”
+After you disable public network access for the service, the self-hosted integration runtime throws following errors: `The Authentication key is invalid or empty.` or `Cannot connect to the data factory. Please check whether the factory has enabled public network access or the machine is hosted in a approved private endpoint Virtual Network.`
 
 #### Cause