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Update troubleshoot-live-response.md

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Adding notes to service dependency to help customers self-resolve common issues with live response
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windows/security/threat-protection/microsoft-defender-atp/troubleshoot-live-response.md
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@ -52,5 +52,14 @@ If while trying to take an action during a live response session, you encounter
4. Navigate to your TEMP folder.
5. Run the action you wanted to take on the copied file.
## Slow live response sessions or delays during initial connections
Live response is leveraging MDATP sensor registration with WNS service in Windows.
If you are having connectivity issues with live response, please confirm the following:
1. notify.windows.com is not blocked in your environment.
2. WpnService (Windows Push Notifications System Service) is not disabled.
Please refer to the articles below to fully understand the WpnService service behavior and requirements:
https://docs.microsoft.com/en-us/windows/uwp/design/shell/tiles-and-notifications/windows-push-notification-services--wns--overview
https://docs.microsoft.com/en-us/windows/uwp/design/shell/tiles-and-notifications/firewall-allowlist-config
'Microsoft Push Notifications Service (MPNS) Public IP ranges' - https://www.microsoft.com/en-us/download/details.aspx?id=44535