# A Connection to the MDM server could not be established

Last updated: July 24, 2026

## Problem

You have scanned the QR Code and downloaded the MDM Profile. However, while installing the MDM Profile, you encounter the error: "Profile Installation Failed. A Connection to the MDM server could not be established."

![Profile Installation Failed error showing a connection to the MDM server could not be established](https://cdn.manageengine.com/mobile-device-management/images/MDM-ProfileInstallationFailed.png)

## Cause

- [Device Connection to the Server](https://www.manageengine.com/mobile-device-management/kb/connection-to-the-mdm-server-could-not-be-established.html#Connection)
- [Blocked URLs from firewalls](https://www.manageengine.com/mobile-device-management/kb/connection-to-the-mdm-server-could-not-be-established.html#Blocked)

## Resolution

1. **Device Connection to the Server:** The device might be unable to establish a connection to the MDM server. Ensure that the proxy or firewall is not blocking the device's connection to the server.
2. **Blocked URLs from firewalls:** The necessary check-in URLs for iOS and Mac devices might be blocked by the firewall. Verify that the iOS check-in URLs (`NAT Address/mdm/client/v1/ioscheckin`) used by the device for enrollment are allowed through the firewall. Additionally, confirm that the Mac check-in URLs (`NAT Address/mdm/client/v1/maccheckin`) used by the device for enrollment are permitted through the firewall.

If the problem still persists, contact **mdm-support@manageengine.com** (MDM On-Premises) or **mdmcloud-support@manageengine.com** (MDM Cloud).