restore missing section

Author: David Curwin

articles/backup/backup-azure-mabs-troubleshoot.md

@@ -71,6 +71,7 @@ We recommend you perform the below validation, before you start troubleshooting
 | Operation | Error details | Workaround |
 | --- | --- | --- |
 | Pushing agent(s) to protected servers | The credentials that are specified for the server are invalid. | **If the recommended action that's shown in the product doesn't work, take the following steps**: <br> Try to install the protection agent manually on the production server as specified in [this article](https://docs.microsoft.com/system-center/dpm/deploy-dpm-protection-agent?view=sc-dpm-2019).|
+| Azure Backup Agent was unable to connect to the Azure Backup service (ID: 100050) | The Azure Backup Agent was unable to connect to the Azure Backup service. | **If the recommended action that's shown in the product doesn't work, take the following steps**: <br>1. Run the following command from an elevated prompt: **psexec -i -s "c:\Program Files\Internet Explorer\iexplore.exe**. This opens the Internet Explorer window. <br/> 2. Go to **Tools** > **Internet Options** > **Connections** > **LAN settings**. <br/> 3. Change the settings to use a proxy server. Then provide the proxy server details.<br/> 4. If your machine has limited internet access, ensure that firewall settings on the machine or proxy allow these [URLs](install-mars-agent.md#verify-internet-access) and [IP address](install-mars-agent.md#verify-internet-access).|
 | Azure Backup Agent installation failed | The Microsoft Azure Recovery Services installation failed. All changes that were made to the system by the Microsoft Azure Recovery Services installation were rolled back. (ID: 4024) | Manually install Azure Agent.
 
 ## Configuring protection group